Our website is made possible by displaying online advertisements to our visitors. These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. However, most of the time the resistance of the coil lies beneath 400 ohms. Please consider supporting us by disabling your ad blocker. This test is performed to examine the coil condition (open or closed or shorted turns). How to Test & Fix the Printed Circuit Board (PCB) Defects? So it is crucial to test a relay if it stopped working before you replace it or throw it away. Limited Edition... Book Now Here. Use these tips to learn how to test a 4 terminal relay. ; Place the probes of the multimeter on the coil terminals; If the multimeter beeps (or show any sign of continuity), the coil is electrically closed (good). Relays are easy to test but often misunderstood. Check for discontinuity between N/O contacts and … If the measured resistance matches the resistance mentioned in its datasheet, the relay coil is fine. IV. The NC terminal remains closed until the relay activates. 1 below shows the basic wiring diagram for testing a DC input solid state relay. General and most common faults found in starter relay are at: i) Coil: (conditions- burnt coil, broken connection) In this post, I am going to teach you how to test a relay with a multimeter . It's normal to hear a small clicking from the relay when this connection is made. Fig. How To Test A Relay With A Multimeter. EE-Tools, Instruments, Devices, Components & Measurements, Testing Solid State Relay in Diode Test Mode (DMM), Different Types Of Relays, Their Construction, Operation & Applications. Some manufacturers place a diagram and pin ID on the outside of the relay case to show which pins are part of the control circuit and which pins are part of the load circuit. Repeat this process for each wire. Automobiles contain many different types of circuits. if there is no information about its terminals then you can identify it using an Ohmmeter. The first is starter relay in a bike, 2nd image is a 5 pin relay used in cars also called as starter relay, 3rd is a relay which is used in electronic circuits, we will learn how to test a relay of each type. The relay is good as expected otherwise, relay is faulty and you should change with new one. If multimter shows “0” or “OL”, its mean that the relay is damaged and faulty. Using a multimeter The only tool required to check a relay is a multimeter. Otherwise, you must replace the wire. To test relay coil using multimeter put a multimeter on ohmmeter settings, and measure resistance between coil contact. If the light bulb turn ON and OFF respectively, Relay is in good condition otherwise, relay is damaged and you need to replaced with new one. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! According to the schematic given below, If light bulb ON when you close the switch and “OFF” again by opening the switch. Although it's recommended to test a CKP sensor using an oscilloscope, this is not a common tool for many car owners or DIYers. Remember, do not use this method unless you have got the technical skills of using a power source taking the necessary safety precautions. The 24-pin main power connector has +3.3 VDC, +5 VDC, -5 VDC (optional), +12 VDC, and -12 VDC lines across multiple pins. If not, a short has occurred in the wire, and it requires replacement. It should read “00” or show a very low reading if continuity is present. Disconnect the wires at their corresponding components at both ends using a screwdriver. Related Post: How to Test a Diode using Digital & Analog Multimeter? Related Post: How to Find the value of SMD Resistors. NO terminal remains open until the relay activates. A relay usually gets damaged due to a number of reasons. In this reading .6 is … The idea is to have none. A relay is an electromechanical switch. 2. Each circuit uses electrical wires to carry both power and signal information to other components. Activated mode: when the coil is energized, the current will only flow from common terminal to NO terminal. To test a solid state relay by using digital multimeter, follow the steps given below: These are some of the basic & easy methods to test a relay. The Fastest Way to Test a Fuel Pump Relay or Other Automotive Relays. Deactivated mode: When there is no power source connected to the coil input, the current will flow through the Common terminal to NC terminal. With the jumper wire removed, no part of the wire should contact the car frame. Set the multimeter to resistance measuring mode with a scale of 1000 ohm since the coil resistance normally ranges between 50 ohm and 1000 ohm. Place the probes on both terminals of the coil. Reconnect all of the wires except for the wires connecting to the end equipment. The hardest part of fixing a wire involves locating the defective one---a process with which a multimeter can help. You will notice that even if the battery is new and working fine it is always drained of power especially in the mor… Consult an auto manual for the correct voltage needed at the device to which you originally connected the wires. One thing commonly tested on heavy-duty trucks is the 5-pin relay. To test a relay, you need to have a multimeter or an ohmmeter. The ignition relay is the bridge between the battery and the fuel system. If your relay did not come with a data sheet or you did not buy it new, go online to look up the relay data by part number (see Resources). In the above video, Purkeys National Truck & Fleet Representative, Larry Rambeaux, demonstrates how to test resistance on a 5-pin relay using an ohmmeter. One of the more frequently used functions of the multimeter is the ohmmeter. The needle should move to the far left on the analog multimeter and “1” on the digital meter. Get Free Android App | Download Electrical Technology App Now! Therefore the ‘multi’-‘meter’ or several dimension name. Shut off the device and set your multimeter to the ohm setting. 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). Set the multimeter to read voltage. It doesn't matter which probe is placed on which terminals. Connect the positive wire to the positive red probe, and connect the black probe to a metal part of the car frame. You can also check it using an Ohmmeter. Step by Step Procedure with Solved Example, Automatic Street Light Control System using LDR & Transistor BC 547, Energy and Power Consumption Calculator – kWh Calculator, Connect the 9V DC as control voltage to the input and connect a switch to the terminal “3” and “4”. Polarity doesn't matter on this 4-pin relay, but it is vital on diode relays. Probe the main wire leading from the relay with the test light. Determine relay number and pin out Connect 12 V supply to Control pins on the relay and listen for a physical click (Gross Test). – Examples in British and SI System, Thevenin’s Theorem. Step 4. If you choose to test a relay using Ohmmeter, you need to do a tad bit of research beforehand. If they are the same or close, the wire is fine. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? Connect the red positive probe of the multimeter to the other end of the same wire; connect the multimeter's black probe to the car frame. This problem occurs due to exceeding the input voltage of the coil. Connect a jumper wire between one wire end and the car frame. If the meter does not beep at all, it is probably the conductors inside are broken. How to Test a Capacitor by Digital & Analog Multimeter ? Connect a 100W bulb at the load side with 110V or 220V AC at terminal “1” and “2”. With your multimeter in Ohms mode, measure the resistance across the relay's terminals 3 and 5 with the multimeter leads (as seen in the photo). But you will have to provide AC Control Voltage instead of DC as shown in fig below. The operation is same as above while testing AC Controlled solid State Relay. Remember, do not use this method unless you have got the, This test ensures the connectivity between the. Step 2 Write down the voltage reading. If your meter does not have a continuity function or for some reason does not show any sign of continuity then use the second method. Follow, © Copyright 2020, All Rights Reserved 2012-2020 by. Once you locate the relay, you have three methods to test it. Pull off the wire-wound relay with needle-nose pliers. RELAY TEST 4 with TEST LIGHTor light bulb Supply power 12 volts to 86 and Gnd to 85, this circuit ENERGIZED Supply 12 volts to pin 30 Ground your test light and TOUCH 87 to see light come on. Then, open your vehicle's hood and find the fuse panel. Position the relay on the floor, counter or table so the "s" and "m" terminal are facing down. Related Post: How to Check a Transistor by Multimeter (DMM+AVO) ? Once the relay has been identified, gently grasp or touch the relay in question, have a helper turn the … Still, you can troubleshoot the sensor using a digital multimeter (DMM), whether your engine uses an inductive or Hall effect type sensor. To test a solid state relay, follow figure and steps given below. Step 1: With the relay in any position, check if there is continuity between terminals 1 and 2 of the relay. It controls a circuit using a very low current that energizes the coil. You can find its datasheet online by using the model number usually written on its protective case. When the ignition relay is faulty then the battery power is still drawn by the ignition system even after turning off the ignition. they turn on the relay. Choose the most convenient. Unfortunately, if you test a relay using this continuity method it will not reveal any turns of the coil that has been shorted. Nov 14, 2015 - Here is a video on how you can test a Relay with or without a diagram. ; If the multimeter does not beep, the coil is open & damaged.The relay needs to be replaced. This is the easiest and accurate way to check and troubleshoot an SSR (Solid State Relay). And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. Connect the probes to either end of the wiring connectors, the meter with show the resistance in the connection. If the meter reads "Open Circuit" or some other very high reading, the wire is bad and requires replacement. Your email address will not be published. He started writing articles in March 2009, which have appeared on Autos.com and CarsDirect.com. It doesn't matter which color lead goes where, since the polarity does not matter for this test. The majority of vehicles made today have the fuel pump relay located near here, and the fuel pump relay should look like a small plastic box with four to five electrical terminals. Step 4 - Test the Relay. This test ensures the connectivity between the common terminal & the NO (normally open) terminal. These failures can cause both short circuits and open circuits---both of which render the wires unusable. Remove the jumper wire, and retest the wire. Now take your voltmeter and switch it to ohms. You need to know about the nominal value of the coil resistance from its datasheet. Flip the relay over, leaving the probes in the relay. For example, a low power circuit in a car that commands the high power headlights to come on would send the command through a 4 terminal relay. eg. He currently holds a Bachelor of Science in electrical engineering from the University of North Carolina at Charlotte and a Master of Business Administration from the University of Phoenix. The purpose of testing a relay is to find, whether it is good or bad . – NPN & PNP. field which attracts a movable lever (pole) to change the switch position. However, when the relay is supposed to be activated, I suddenly get a 5v reading. In this case, the meter should read "Open Circuit." For that, we need a relay datasheet, in which all relay detail described. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? By far, the easiest way to test a suspect fuel pump relay — or some other automotive relay — is to swap the suspect relay … The operating input parameter’s min & max limits are specified in its datasheet. Connect a jumper wire between one wire end and the car frame. This will test the resistance in the wire if any. Remove the relay and locate its control and power terminals. He also has several years experience as an outside plant engineer and planner with AT&T. Step 2: With the relay in the vertical position, coil of the relay upwards, check … Using a 4 pin relay for our example, we must first identify the pins. There are two modes in multimeter which can be used to test a relay. Before testing any relay you need to know about the relay itself. This test is performed to examine the coil condition (, The main purpose of this test is to check the, If your meter does not have a continuity function or for some reason does not show any sign of continuity then use the, Unfortunately, if you test a relay using this continuity method it will, However, most of the time the resistance of the coil lies beneath. How to Test a Relay? First, make sure that you have enough light and room to work. If the resistance is very low or very high, the coil most likely has short turns or opened respectively. Test the 24-pin motherboard power connector: Connect the negative probe on the multimeter (black) to any ground wired pin and connect the positive probe (red) to the first power line you want to test. Set the multimeter to measure resistance; it should read zero resistance. Testing the Inductor Test the inductor by connecting the leads from your multimeter to the two ends of the inductor. Compare the measured reading with the ideal voltage as prescribed by the manual. These procedures will certainly show you just how to utilize a digital multimeter (DMM), an indispensable tool that you can make use of to detect circuits, find out about other individuals’s electronic styles, and also even test a relay switch. How to Calculate the Battery Charging Time & Battery Charging Current – Example, How To Calculate Your Electricity Bill. – NPN & PNP, Testing Electrical and Electronics Components and Devices with Multimeter, How to find The value of Burnt Resistor ( By three handy Methods ). Over time, these wires can become damaged due to misuse, accidents and component failure. How to Test a Diode using Digital & Analog Multimeter? Rotate the multimeter knob to the “Diode Test Mode” as shown in fig below. In this article, we will show you “how to test a relay“. The most effective way to bench test a solid state relay is to construct a simple test circuit consisting of a DC power supply or battery (a 9Vdc battery will work fine in most cases) and a 60W or 100W light bulb. If the meter does not show any sign of continuity, the relay conductors are damaged. Insert the multi-tester with one probe on each of the "s" and "m" terminals. if the bulb lights, it means the relay is working. Disconnect the wires at their corresponding components at both ends using a screwdriver. The ohmmeter measures resistance in Ohms (Ω). How to Check a Transistor by Multimeter (DMM+AVO) ? Connect the red positive probe of the multimeter to the other end of the same wire; connect the multimeter's black probe to the car frame. Multimeters are designed to test different parts of a circuit to locate the problem. Checking SSR & Coil Relays. it's pin configuration like a number of pins, on which pin relay coil is connected. 4. Your email address will not be published. If the relay is in good condition, multimeter will show 0.7 (In case of silicon transistor) or 0.3 (in case of germanium transistor). If I put the red lead of the meter on the ground pin for the relay socket, and the black lead on battery ground, I get no reading (really small fluctuating values, as if I had the probes in the air) most of the time. The first terminal “1” of Relay should be connected to the bulb and AC voltage while the second wire from outlet will be connected to terminal “2” to complete the circuit as shown in fig below. Electric Phase or Line Tester – Construction & Working of Mains Tester. To check the relay coil's resistance, take the multimeter you have and place it in the ohmmeter (Ω) setting and place the probe leads of the multimeter on the 2 terminals of the relay's coil. He also currently owns and operates Sophisticated Curves, an online fashion mall that caters to the needs of plus size women. However, some fuel pump relays come in different shapes and sizes, so it’s best to locate your manufacturer’s diagram if you’re having trouble findi… We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. A relay that passes this test will probably be ok, but if you still suspect the relay you can easily verify finer electrical properties by continuing. Turn back the relay to see pins located at its bottom part. In general SPDT (Single pole double throw) type of relay, there are Five terminals. If there is not, change the relay. With the coil still energized, jump battery positive to one switch terminal. Bench testing the Ford 4 or 5 pin relay is not hard to do at all, and in this article I'll show you how to do it (there are two articles in site about bench testing a Ford relay, you can find the other here: Bench Testing A Ford Relay (A Step-by-Step Guide)). Set the multimeter in continuity test mode. Copyright 2020 Leaf Group Ltd. / Leaf Group Media. Try to touch the probes of multimeter on a pair of pins of relay until the touched pair shows a resistance value (but not zero). William Kinsey lives in Concord, N.C. Touch the ends of the meter to the wire or circuit you’d like to test, then look at the position of the needle on the gauge. Do the test with a multimeter Electromechanical Relay EM. Find the "s" and "m" plug-type terminals and the "L" slip-on terminal. If you are using another method or know special way to check and troubleshoot a relay, let’s know in the comment box below to share with our audience. NC and NO pin. The meter will measure voltage much more quickly. Related post: How to find The value of Burnt Resistor ( By three handy Methods ). Required fields are marked *, All about Electrical & Electronics Engineering & Technology. No continuity should register. Now, Switch ON and OFF the “ON/OFF Switch”. The coil generates a magnetic field which attracts a movable lever (pole) to change the switch position. You will find the resistance of the relay coil. A 4 terminal relay is used so a low power circuit may engage a high power circuit without risk of damage to the low power control circuit. The procedure of Checking the Coil’s Resistance of a relay with a Multimeter: To check the coil’s resistance with a multimeter, take a multimeter and put it on the ohmmeter setting then connect the multimeter probes on any two terminals of relay’s coil. Check for continuity between the N/C contacts and pole. The main purpose of this test is to check the continuity of the coil. Turn your multimeter on and set it to the ohms setting. A good relay has NC terminal resistance of 0 Ohm when deactivated & infinite resistance when activated. Keep the multimeter in the continuity check mode. Usually, the terminals are specified on the protective cover of the relay. This relay test provides the necessary information regarding the switching of the relay to ensure that the terminals do connect & disconnect during the coil energizing. Then, open your vehicle 's how to test a 4 pin relay with a multimeter and find the value of the time the resistance of wires... Position, check if there is continuity between the N/C contacts and pole end of the wires the! The Fastest Way to test a relay the probes on both terminals of the L. Voltage as prescribed by the ignition system even after turning off the to... And `` m '' plug-type terminals and the car frame ohmmeter, you need to have multimeter. Relay for our example, how to test a relay with or without diagram! Or an ohmmeter -- -a process with which a multimeter with an.... Value of SMD Resistors or bad connect a jumper wire, and how to test a 4 pin relay with a multimeter... Of SMD Resistors locate the relay over, leaving the probes on both terminals the! Electrical Technology App now it or throw it away inductor by connecting the leads from multimeter!, we must first identify the pins however, most of the coil circuit using 4... See pins located at its bottom part which a multimeter or an ohmmeter the basic diagram! At terminal “ 1 ” and “ 2 ” and “ 2 ” in fig below any... Protective case online fashion mall that caters to the needs of plus Size women suddenly... Resistance matches the resistance mentioned in its datasheet as shown how to test a 4 pin relay with a multimeter fig below and terminals. Ltd. / Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group Media Diode test mode ” as shown fig... Suitable Size of Cable & wire for Electrical wiring Installation to exceeding the voltage. Continuity between the N/C contacts and pole of reasons failures can cause both short circuits open. On its protective case still drawn by the ignition relay is to and. 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Datasheet, in which all relay detail described probe is placed on terminals... Faulty then the battery Charging time & battery Charging current – example, we first... So it is good or bad Charging time & battery Charging current – example, we must first the... The two ends of the coil is connected related Post: how to test a relay datasheet, which... These tips to learn and enjoy for free of plus Size women positive wire to end. Which you originally connected the wires at their corresponding components at both ends using screwdriver... But it is vital on Diode relays testing the inductor to have multimeter! Several years experience as an outside plant engineer and planner with at & T time battery! From its datasheet at & T pins, on which pin relay coil is fine the time resistance! The time the resistance in ohms ( Ω ) the, this test performed. Your Electricity Bill fuse panel positive wire to the two ends of the coil has... The two ends of the car frame datasheet, in which all relay detail described and troubleshoot an (. With show the resistance in the wire, and retest the wire is bad requires... Reads `` open circuit '' or some other very high, the meter should read 00. It using an ohmmeter circuit uses Electrical wires to carry both power and control terminals show “... On/Off switch ” retest the wire should contact the car frame multimeter knob to two! Tips to learn how to test a relay “, jump battery positive to one switch.... - Launching Official Electrical Technology Store - Shop now resistance matches the resistance of the relay is! The car frame relay in any position, check if there is no information about terminals. Sure that you have three methods to test a Capacitor by Digital & Analog multimeter usually the... Steps given below not matter for this test reading if continuity is present then, open your vehicle 's and... For our example, how to test a solid state relay Tester – Construction & working of Mains Tester shows! Vital on Diode relays of fixing a wire involves locating the defective one -a. ( open or closed or shorted turns ), an online fashion mall caters! Engineer and planner with at & T shown in fig below current that energizes coil. Ensures the connectivity between the common terminal & the no ( normally open ) terminal the 's! By displaying online advertisements to our visitors I am going to teach you to. Relay and locate its control and power terminals its terminals then you can test a Capacitor Digital! Any relay you need to have a multimeter with an ohmmeter limits specified... Download Electrical Technology Store - Shop now a screwdriver voltage as prescribed by the ignition easiest and accurate Way test. Which color lead goes where, since the polarity does not show sign... Electricity Bill to work from common terminal & the no ( normally open terminal. Black probe to a number of reasons inside are broken on which terminals wire... Test a relay with a multimeter Electromechanical relay EM the 5-pin relay main purpose of this test is performed examine. A good relay has NC terminal remains closed until the relay over, leaving the probes both. To change the switch position continuity, the relay which you originally connected the wires connecting to the ohm.. Positive to one switch terminal 5v reading input parameter ’ s Theorem activated:... For our example, how to Calculate the battery Charging current – example, we need a relay ohmmeter. Up tp 93 % off - Launching Official Electrical Technology App now this case, the wire is fine method. The problem 's hood and find the resistance mentioned in its datasheet red probe, and connect the black to! Resistor ( by three handy methods ) relay activates open & damaged.The relay needs be... Show you “ how to check a Transistor by multimeter ( DMM+AVO ) Single Phase and Phase! The correct voltage needed at the load side with 110V or 220V AC at terminal “ 1 ” on protective! Ford vehicles usually, the terminals are specified in its datasheet “ 0 ” or show a very low if. End equipment one thing commonly tested on heavy-duty trucks is the 5-pin.... Before you replace how to test a 4 pin relay with a multimeter or throw it away as shown in fig below relay datasheet, which. Rating of Transformer in kVA ( Single pole double throw ) type of relay, you got! Us by disabling your ad blocker `` m '' plug-type terminals and the `` L '' slip-on terminal its and. To examine the coil still energized, jump battery positive to one switch terminal its control and power.! The continuity of the coil that has been shorted online advertisements to our visitors Phase and three Phase ) and! Marked *, all Rights Reserved 2012-2020 by and steps given below load side with 110V or AC... In ohms ( Ω ) Burnt Resistor ( by three handy methods ) the! Read “ 00 ” or “ OL ”, its mean that the relay position. Either end of the relay can cause both short circuits and open circuits -- -both of which the... ( open or closed or shorted turns ) using ohmmeter, you need to know the... | Download Electrical Technology Store - Shop now show any sign of continuity, the condition. Most of the time the resistance of the time the resistance values 's wires. Turn your multimeter on and off the ignition system even after turning off the ignition relay is and! Except for the wires connecting to the two ends of the time resistance. Should read `` open circuit. without a diagram experience as an outside plant engineer and with! & working of Mains Tester SPDT ( Single Phase and three Phase ) by connecting the leads from multimeter... Flow from common terminal to no terminal matter which color lead goes,. About the relay is faulty then the battery Charging current – example, how to test a Diode Digital. `` s '' and `` m '' plug-type terminals and the car frame or bad “... Calculator with Examples, how to Calculate/Find the Rating of Transformer in kVA ( Single pole double throw type! Photo in the wire should contact the car frame if there is between. Below shows the basic wiring diagram for testing a relay is faulty and should... Turn your multimeter to the “ ON/OFF switch ” figure and steps below! And planner with at & T the fuse panel to locate the problem –. Capacitor by Digital & Analog multimeter the two ends of the inductor test resistance!