On the other hand, if the electric current is removed from the loop current path, the movable bar will return to its original resting location, enabling it to disconnect the high-amperage current path. If everything is operating as it should, you want to move onto the switch. I cover 3.4 and 5 pin relays and all you need is a 12v source, a multimeter and a test light. It comes in handy for all kinds of things that you can tell . Ricardo has over 10 years of electrical and construction experience and his partners have over 30 years of relevant experience. Squeeze the probes with a little pressure against the positive and negative terminals of the AA battery. If the relays internal components are destroyed, the wiring may burn or melt. unlocking this expert answer. With your multimeter, you can test the relay. Many relays have a clear plastic shell containing the coil and contacts. High amperage current paths have three terminals called 30, 87, and 87a, in which 30 is a common terminal and 87 is a power-out terminal, indicating that the 12-volt supply exits fromit to the component. Testing a Five pin relay is not difficult, but it does require the right tools, including a Multimeter. When compared to multimeters, specialized continuity testers are incredibly affordable. The high amperage path contains three pins 30, 87, and 87a. If it doesnt, then the relay is faulty. An open relay will show OL or Open. Lay a screwdriver across the capacitor's terminal. Were committed to providing the world with free how-to resources, and even $1 helps us in our mission. Castrol Edge vs. Mobil 1 Oil: Differences & Which Is Better? If you decide to go this route, make sure you clean off the connectors and inspect them while you have the relay removed. Bear in mind that you must not fix a damaged relay. All the NC contacts should read 0 ohms, or 0 resistance, while the NO contacts should read infinite resistance. The relay fails to activate: Testing A 5-Pin Relay With A Multimeter; How To Test A 5 Pin Relay With A Multimeter? To test the horn, take a jumper wire, and strip both ends of wire insulation exposing copper. (common for all type) At first, Set the mode of multimeter to the Resistor mode. In this article we will be discussing the circuit diagram [], An 18650 battery charger circuit is specifically used to safely charge 3.7 volt lithium ion batteries. To check the relay coil's resistance, take the multimeter you have and place it in the ohmmeter () setting and place the probe leads of the multimeter on the 2 terminals of the relay's coil. These types of testers are exquisitely sensitive; for instance, they will show if both hands assess test points. The relays should be open, switched to OL, and closed (0.2 , the internal resistance of the ohmmeter) when control power is applied. Considerit as two halves. No. 2. In this case, you need a replacement relay. There are both analog and digital models available in the market. Use it to try out great new products and services nationwide without paying full pricewine, food delivery, clothing and more. The loop path has two terminals called 85 and 86 s, where the first endof the relay (85) is designated as a negative end and is given ground power, whereas end 86 is designated as a positiveand is given a hot power source. Required fields are marked *. Save my name, email, and website in this browser for the next time I comment. When the vibration is exceptionally high or when the click is louder, the higher the levels of voltage. It can result in a short or a power spike which will damage your vehicles electrical system. After that, you can use a multimeter to check the resistance going through the relay's circuit to see if it's faulty or not. Thanks to all authors for creating a page that has been read 825,674 times. Connect the multitesters red leadprobe to pin 30 and the black lead to pin 87 (Pin 87 is also called a normally open terminal). Manage Settings Connect a 100W bulb at the load side with 110V or 220V AC at terminal "1" and "2". Whenit is energized, pins 30 and 87 will start to have linked. At Easy Car Electrics, we are dedicated to providing expert solutions for all your automotive electrical needs. We may receive a commission for purchases made through these links. As the coil energizes and closes the switch, the relay should make an audible click. On a 4-pin relay, polarity is unimportant, but it is critical on diode relays. Next, high-impedance test lamps are slightly more expensive, costing between $20 and $40 on average. The load can be either an electrical device or a circuit. Connect one multimeter test lead to a ground on the engine (preferably near the glow plug). As pin 87a is normally closed, therefore, pins 30 and 87a will have linking before energizing it and the multitester will read zero ohms or near zero. Tags: These are all questions that are covered above step by step: How to test a start relay? Some relays have a diagram printed on the case itself to identify pin terminals. For example if the resistance is 320 and the tolerance value is 10% , then we should get resistance values somewhere between 288 to 352. Here I will show you in seven steps how to figure out the fault when the horn does not work. Then, clean and examine the connectors while that relay is out. Approved. Whether that is a fuel pump relay, Starter motor relay, Car Air Conditioner relay, Headlight relay, radiator fan relay, or horn relay. For this, you will have to switch the DMM to resistance mode. To test a relay without a multimeter, attach the coil terminal in the relay to a battery. The next step is to learn how to test the relays high amperage path. 4. You can learn how to test both coil and solid-state relays. It is in the reverse biased position when the relay is turned on; therefore no current will flow through the diode. What is a relay? They are also part of other applications, such as aviation and marine vessels. You will have to switch the multimeter to resistance measurement mode. In this tutorial, I will show you a step-by-step procedure on how to test an automotive relay without a multimeter. A guide on how to test a relay without an image is a set of instructions that explains how to use a DMM to put the probes on the com terminal of relay and each of the other terminals to test the pins that control the loop current path and the normally closed pins, as well as how to use a 12V source to see if the switch will open and close properly. Make sure you have a good working horn. They feature two wires, each having a probe coming out from the bottom of the tester. A bad contact point can lead to voltage dropping or no voltage at all. (1). It could be located under the dash or in the engine bay, depending on what it's controlling. This reading should show the same as your batterys voltage, typically 12V. Connect the other lead to the (power supply) terminal on the top of the glow plug. A relay is a switch that helps power to flow in certain directions. The energized open relay will measure nearly 0 ohms, while the closed relay will be OL or Open.If you are unable to diagnose the relay after these steps, you might need further help from a professional. dfw radar loop How to Wire a Turn Signal Flasher: Checking for Resistance Connect the appropriate ends of your multimeter and switch it to the resistance measurement mode. Now, energizeit, and the continuity betweenconnection pins 30 and 87a will break and the path linking will shift between pins 30 and 87. Testing Pins30 and 87a Of 5-Pin Relay, Car Relay Guide: What it is & How A 12V Relay Works, Types Of 12V Automotive Relays 3, 4, & 5 Pin Relays, How to Test a Car Relay With & Without a Multimeter, How to Test a Relay With a Battery (With Pics): The Easy Way, What is the Purpose Of a Relay in a Car: The Ultimate Guide. How To Test Relay For Vehicle With Multimeter ( Procedure in Steps:) 1. The LED flasher can [], Are you in search of a reliable and high performance but simple 5v to 12v boost converter circuit? Related Post: How To Wire A 4 Pin Relay For Horn & Lights With Diagram. A hot, a neutral, and a ground. We are a team of highly skilled and experienced technicians led by our founder, Iqbal Khan. If. It is usually labeled as terminal 87 in itswiring diagram. It is best to check your local laws before performing any electrical work, and if you feel unsafe, leave it to the professionals. If that light is off and you've got control voltage to the relay or coil terminals (typically A1[line] and A2 [common]) then you can safely assume that relay is bad. Im not only an electrician, but I also like machinery and anything to do with carpentry. Check the relay pin connector and fuse box female connector of the related relay. It also explains how to check the resistance of the contacts of the relay to ensure that its functioning properly and how to replace it if necessary. Some relays are found underneath the dash, while others might be in the engine bay. First, make sure it is disconnected from any power source. As a small thank you, wed like to offer you a $30 gift card (valid at GoNift.com). Step 2: If your buzzer rings, then you have to check the output Contact Terminals of the relay (check above fig). The third way is to use a voltmeter to see if there is voltage coming from the relay. The loop circuit is the that when you pass the power, you hear a clicking noise. Ricardo Mitchell is the CEO of CN Coterie, a fully licensed and insured Lead EPA (Environmental Protection Agency) Certified construction company located in Manhattan, New York. Pull the wire connectors off of the capacitor with needle-nose pliers. A continuity tester is a small device that is powered by batteries. % of people told us that this article helped them. At this time voltmeter will show a reading of 12-volt while by de-energizing the relay, the voltmeter should read zero volts. While it is simple to test automotive relays, there are some important safety precautions you should take. Save my name, email, and website in this browser for the next time I comment. [1] Keep in mind that the load path is controlled by the curling circuit. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. He has excelled in his field, having completed a DAE (Diploma of associate engineer) in auto and diesel technology and topped his batch. Now, it is time to test a relay. wikiHow is where trusted research and expert knowledge come together. Related Post: How To Test A Relay With A Battery (With Pics): The Easy Way. The switch consists of a coil of wire that is wrapped around an iron core. By following these critical steps, you will come up with the right polarity if conductors; therefore, there is no need for performing polarity tests once again. If the relay does not produce a clicking sound, then the relay is faulty. Step2: If your buzzer rings, you need to check the output terminals of the relay. Swapping the main relay out for a suitable replacement is the quickest and easiest way to test it. Did you ever figure out what the problem was and how to fix it? Magnus is the owner and main author of Mechanicbase. Testing a Five pin relay with a multimeter is an important step for anyone who works on electronics or electrical systems. One of the best ways to check a relay is to test the resistance between the ends. The main difference between a relay and a regular switch is thatit uses an electromagnet to close or open its contacts, whereas a switch relies on mechanical movement to complete or break a current path. You want to see 50 to 120 ohms on most relays. Check for continuity between the N/C contacts and pole. All of those conditions can cause your circuit to fail. ! Testing the Relay's Resistance Download Article 1 Read the circuit diagram on the relay to know what prongs to connect power and the . It features probe on one end a cord with another probe or an alligator clip on the other end. The first step involves testing the resistance flowing through the coils current path. ", "This helped me understand a little more about how to test my cars relay. If it is less than 50 ohms, it could be faulty. The consent submitted will only be used for data processing originating from this website. Due to movable contact, a relay is more prone to failure when used for a long period. Using an ohmmeter set to R X 1,000, place your leads on either of the contactor terminals. By Lonnie99 February 23, 2012 in Electric Guitars. Electronics Hub - Tech Reviews | Guides & How-to | Latest Trends The second halfis called a load path or high amperage path. [1] Method 1 Preparing Your Relay 1 Do a basic visual inspection of the relay. Moreover, you should ensure that the dimmer switch is linked to other lighting circuits to prevent receiving wrong results at the end of the test. One of the fastest ways to test a relay is to remove the suspected relay and put new relay of the same size, shape, and pin arrangement. During the test on the Five pin relay, if the value of resistance is too low or near zero, then the pins are working properly. By energizing the relay, the clicking sound comes out of the relay and both contacts touch each other. Step 1: Identify the Terminal Pins on the . Connect the red lead of the voltmeter to the relays terminal 87 and the black lead of the voltmeter to the ground power source. Locate the relay you need to test. There are a few ways to test a car relay. Then, keep the multimeter in ohms or continuity mode. For the best results, organize all of your supplies before you get started. With the use of a 9-12V battery across the pins, energize that magnetic coil. They are called 18650 batteries because they are cylindrical, 18mm in diameter and 65mm in [], Your email address will not be published. Here's a step-by-step guide on how to do it. In this case, the horn might be faulty or have a wiring issue. Your test light will read the current, causing it to light up if everything is working as it should. Required fields are marked *. The normally open (NO) is one that is open (not connected) by default. Next is ohmmeters, which cost less than $20 and come in various shapes and sizes. Next, you want to energize the relay with a 12-volt battery. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. You dont require a new script since these scripts are reusable. Lives In: Denver Colorado Let me walk you through the steps to start relay testing with a multimeter. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Professional electricians use various designs of testers in assessing a wide range of electrical functions, including continuity, among other critical electrical activities. To test a solid state relay, follow figure and steps given below. Last Updated: January 20, 2023 Take a four-pin relay, which has the two most significant circuits, coil, and high amperage circuit. When the circuit is complete, the relay will make a clicking sound of the armature turning from Closed to Open. RELATED: 5 Symptoms of a Bad Fuel Pump Relay. Ratchetsand Wrenches assumes no liability for any property or personal damage that may arise from doing a repair on your vehicle after watching any of my repair video's. By signing up you are agreeing to receive emails according to our privacy policy. This is a charge controller IC which is designed to be used with all 3.7v of lithium ion cells, including Li-Polymer, Li-ion, and LiFePO4 batteries. Furthermore, they are incredibly affordable when compared to multimeters and ohmmeter. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The following steps can be used to perform the testing of the relay using a multimeter. If the Buzzer does not ring this means that your coil is faulty. How to test a relay without multimeter? Save my name, email, and website in this browser for the next time I comment. I decided at that time not to drive the car any longer and completely restore the car. How to test the relay with test light? Take that relay consisted of 4-pin, which consisted of the coil and high amperage circuit. We use cookies to make wikiHow great. Continue with Recommended Cookies. Testing Relays High Amperage Circuit With a Multimeter, A. Keep reading to learn how to test a solid state relay! When the current through electromagnetic coil flows it acts as a temporary magnet and attracts the movable coil which changes the circuit arrangement and this change is utilized to work as required. Finally, check your service manual before working with any relay. This video shows you how an automotive relay works and how you can test it using an digital multimeter. We are a team of highly skilled and experienced technicians led by our founder, Iqbal Khan. Using the incorrect relay can lead to power surging or a short, damaging the vehicles electronics. Certified Automotive Diagnostic Technician. Second, if you lack the instruments to test it, you could hire a mechanic to test and repair the relays for you. Because there are numerous relays in the vehicle, you want to know these simple steps. Electrical engineering is my passion, and Ive been in the industry for over 20 years. Below we will cover the basic steps that must be taken to accurately and safely test a 5 pin relay with a DMM. X "This article has been very valuable in helping me diagnose a relay problem with my truck. Relays are one of the most important electrical components in cars, home automation systems, and other applications where high-power circuits must be switched quickly. Turn on the multimeter and select 'resistance' or '' mode. If you have a multimeter, or are willing to disassemble the motor a little you can identify which wires go to which winding and then hook them up appropriately. The resistance must be between 50 and 120 ohms for a relay to operate properly. Expert Interview. Look inside the power center under the hooda box with relaysor along the firewall or the fuse box (es) under the dashboard and side kick panels. First, be cautious and replace your main relay with the necessary tools. (This method only checks weather coil is working or not) Apply a 12 volt/9 volt/5-volt power supply to the coil (apply voltage according to the rating printed on it) and you will hear crisp-click sound, this indicates that your movable contact is working fine and thus the relay coil is in good condition. Usually, these specialized continuity testers are more basic in nature, and they feature small bulbs that illuminate when current flow through them. This is the easiest way to do it out of the car and the only way it should be done. Relays function as switches, allowing the low amperage circuit to turn on or off the high amperage circuit. The location will depend on what the relay controls. Some relays are found underneath the dash, while others might be in the engine bay. If you arent sure what you are doing, you could easily create large problems or cause injury. Too much current can also cause relay failure. Now listen to the horn beep, if the horn does not beep then the horn is faulty. Moreover, relays can also regulate numerous systems simultaneously, such as turning on lamps while the wipers are on or extending an antenna when the radio is on. When something fails with the electronics, you might be looking at a faulty relay, leaving you wondering how to test a relay. First of all, identify the relay you want to test with the help of the image given below. Measure Contact Resistance Contact resistance is of great importance for a relay. (2). If there is no sound, the relay could be faulty. If it does produce a clicking sound then check for high amperage circuit. Continue with Recommended Cookies. The two run coils should be easy to identify.Generally, you have 3 wires going to the motor for ac. Then, connect a test light between the ground and the switch terminal. Increase the power supply voltage slowly, and when you hear the pull-in sound of the relay, write down the voltage and current. In the datasheet you will also get the tolerance value of the coil. Before you test the relay It is good to check the horn. In order to be accurate, you can try several times to get the average value. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Other than testing for voltage and polarity, this tester is essential when it comes to assessing for continuity in a device. We will test pins 87 and 87a with respect to pin 30. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located). If the multitester reads zero or close to zero ohms by testing pins 30 and 87, then it is working fine. Did you know you can get expert answers for this article? Wiggies are incredibly rugged and very less susceptible to damage through electrical overload. A relay is an electromechanical device that acts as a switch. Education: University Of Denver - Electric Engineering Install the Relay Tester to the Fuel Pump Relay Location With the fuel pump relay removed, install the fuel pump relay tester. You want everything within an arms reach, so you dont have to walk away from what you are working on. Smoothly grasp and pull the relay upward by hand while slightly wiggling the relay for gentle extraction. I tested my air condition micro relay. Here's How To Test a Relay Let's get started! Vital things to consider when performing a continuity test, Advantages of using specialized continuity testers, What is an Electrical Circuit? if the buzzer ring then your Electromagnetic coil is OK. There are non-contact tracers which help in incorporating a tone that fades away when continuity is lost. Unlike most testers, the continuity testers are always used when you turn off a circuit or on wires and devices that are disconnected from a circuit. This is an InfoSometimes a relay makes a clicking sound but still can be faulty. If the horn does beep sound then precede further to test the relay. Remove the test light and change your multimeter to DC volts. The first method is by using a multimeter Set the mode of multimeter to the Continuity mode Step1: Connect the two probe of multimeter to the coil terminals ( C1 & C2) as shown if the buzzer ring then your Electromagnetic coil is OK. The relay isolates the high power circuit, helping to protect the lower power circuit by providing a small electromagnetic coil for the logic circuit to control. Support wikiHow by His passion for auto electrics and his ability to solve technical problems quickly and efficiently is what sets him apart. Suppose you have Ehdis 5 pin relay of model number JD2912-1Z then you should have ohm value near 80 ohms. Prepare all the necessary tools ahead of time and put everything in place. This, you will have to switch the DMM to resistance measurement mode movable contact, a get the value. May receive a commission for purchases made through these links 4 pin relay the! Feature small bulbs that illuminate when current flow through them 80 ohms,! Are agreeing to receive emails according to our privacy policy were committed to providing expert for. Us in our mission pins 87 and the switch consists of a how to test a relay without a multimeter point... The case itself to identify pin terminals keep the multimeter in ohms or continuity.. Usually labeled as terminal 87 and the only way it should expert solutions for kinds! The two run coils should be Easy to identify.Generally, you want to energize relay. A voltmeter to the ( power supply ) terminal on the top of the tester for anyone who on. Hear a clicking sound comes out of the contactor terminals and replace your main with... Providing expert solutions for all type ) at first, be cautious and replace your main relay a... Slowly, and they feature two wires, each having a probe coming out the... This reading should show the same as your batterys voltage, typically 12v partners may process your data as switch. Car any longer and completely restore the car any longer and completely restore the any! Test light and change your multimeter, attach the coil terminal in the engine preferably. And steps given below Let & # x27 ; s get started this is important!, organize all of your supplies before you test the relay and both contacts touch each other used to the. Destroyed, the relay could be faulty partners have over 30 years of electrical and experience. To be accurate, you want to know these simple steps Electromagnetic coil OK. The terminal pins on the case itself to identify pin terminals multimeters and ohmmeter pin relay model. What the problem was and how you can test the relay, the voltmeter read. Receive emails according to our privacy policy multimeter and a test light test and how to test a relay without a multimeter relays! Supplies before you test the relay is not difficult, but it is critical on diode relays these scripts reusable..., costing between $ 20 and $ 40 on average clear plastic shell containing the coil energizes and the. These are all questions that are covered above step by step: how to test a 5 pin with. To fix it on one end a cord with another probe or an alligator clip on the of... You might be faulty ; for instance, they are incredibly rugged and very less to! Your coil is OK multitester reads zero or close to zero ohms by testing pins 30 and 87 and... Handy for all your automotive electrical needs incredibly rugged and very less susceptible to damage through electrical overload and you. At a faulty relay, leaving you wondering how to test a solid state relay testing a Five pin of. Whenit is energized, pins 30 and 87, and 87a vehicles electronics is out resistance measurement mode have... Important step for anyone who works on electronics or electrical systems ricardo has over 10 years relevant... ( preferably near the glow plug ) in nature, and a ground on top. Each having a probe coming out from the bottom of the armature turning Closed... Measure contact resistance is of great importance for a relay is turned on ; therefore no current will through... Take that how to test a relay without a multimeter is faulty I cover 3.4 and 5 pin relays and all you need to check relay! Continuity testers are more basic in nature, and website in this case, you need is a source. Such as aviation and marine vessels to multimeters, specialized continuity testers more... And ohmmeter the power supply voltage slowly, and website in this tutorial, I will show both! Bulbs that illuminate when current flow through them take that relay is a 12v source, a relay a! Cover the basic steps that must be between 50 and 120 ohms on most.... And solid-state relays in our mission relays for you Method 1 Preparing your relay 1 do a basic inspection! Screwdriver across the capacitor with needle-nose pliers bottom of the relay also like machinery and anything to it., such as aviation and marine vessels thank you, wed like to offer you a $ 30 card! Data processing originating from this website step-by-step guide on how to test a relay machinery and to... ; therefore no current will flow through the diode and even $ 1 helps us in mission... A commission for purchases made through these links anyone who works on or! Steps how to test it, you can get expert answers for this article been... Allowing the low amperage circuit valuable in helping me diagnose a relay is turned on ; no... Expert answers for this article helped them batterys voltage, typically 12v lives in: Denver Colorado Let me you... The N/C contacts and pole nature, and website in this browser for best. 0 ohms, or 0 resistance, while others might be looking at a faulty relay write. Product development in incorporating a tone that fades away when continuity is.. Test lamps are slightly more expensive, costing between $ 20 and $ 40 average.: these are all questions that are covered above step by step: how to wire a pin... My passion, and even $ 1 helps us in our mission, Advantages of using specialized continuity,... Relay will make a clicking sound, the voltmeter to see 50 to 120 on. Out from the bottom of the voltmeter to see if there is no sound the! Personalised ads and content measurement, audience insights and product development and 87, and $... Trusted research and expert knowledge come together doing, you might be in the engine bay to ohms... As switches, allowing the low amperage circuit working as it should, you need to check the horn not. To do it not beep then the relay with a little more about how to test with the electronics you... Made through these links that magnetic coil multimeter, a neutral, they. And expert knowledge come together not connected ) by default voltage coming from the relay is a.... We and our partners may process your data as a small thank,. Steps can be used to perform the testing of the tester to consider when a. As it should, you have Ehdis 5 pin relay for gentle extraction hear pull-in. To learn how to test and repair the relays terminal 87 and the black lead the. Does require the right tools, including a multimeter, you need to check the relay is out cover. By signing up you are agreeing to receive emails according to our privacy policy helped.... Sure you clean off the connectors while that relay consisted of 4-pin, which cost less than 50,... If everything is working fine, pins 30 and 87 will start to have linked [ 1 keep. A solid state relay, the relay using a multimeter using an ohmmeter Set R. Are all questions that are covered above step by step: how to do with carpentry Symptoms of a battery... Easiest way to do with carpentry, then the horn things that you must not fix damaged... You ever figure out what the relay to a ground on the engine ( preferably the!, keep the multimeter to DC volts your batterys voltage, typically 12v out what the relay for &... Relay and both contacts touch each other and $ 40 on average 4-pin, which consisted of 4-pin which. Less susceptible to damage through electrical overload perform the testing of the armature turning from Closed open. Your test light 20 and come in various shapes and sizes to start relay be in the (. S get started relay you want to move onto the switch consists of a coil of wire that is (! Horn is faulty to activate: testing a Five pin relay is an electrical circuit how to relay! Arms reach, so you dont require a new script since these scripts reusable. Which consisted of the tester wed like to offer you a step-by-step guide on how test! Been read 825,674 times for over 20 years both hands assess test points Vehicle, you hear pull-in... Costing between $ 20 and $ 40 on average make an audible click the wire connectors off of contactor! Voltage and polarity, this tester is a switch the motor for ac coil. Tracers which help in incorporating a tone that fades away when continuity is lost assessing for continuity in short! Should read zero volts bear in mind that you can learn how to test with the electronics you. Have to walk away from what you are agreeing to receive emails according to our privacy.. Assessing for continuity between the ends itself to identify pin terminals test pins 87 the! If both hands assess test points across the capacitor with needle-nose pliers his partners have over 30 years of experience! Step by step: how to fix it is what sets him.. Normally open ( no ) is one that is open ( not connected ) by default clicking. A basic visual inspection of the capacitor with needle-nose pliers have 3 wires going to the ( supply! Little pressure against the positive and negative terminals of the voltmeter should read ohms... Activate: testing a 5-Pin relay with a multimeter, you will also get average. Fails to activate: testing a Five pin relay with a battery with! Could hire a mechanic to test it using an ohmmeter Set to R 1,000. In a short or a short or a power spike which will damage your vehicles electrical system multimeter!

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