it's pin configuration like a number of pins, on which pin relay coil is connected. It's normal to hear a small clicking from the relay when this connection is made. A relay is an electromechanical switch. He also has several years experience as an outside plant engineer and planner with AT&T. Place the probes on both terminals of the coil. Step 2: With the relay in the vertical position, coil of the relay upwards, check … First, make sure that you have enough light and room to work. – Examples in British and SI System, Thevenin’s Theorem. Before testing any relay you need to know about the relay itself. The relay is good as expected otherwise, relay is faulty and you should change with new one. Related post: How to find The value of Burnt Resistor ( By three handy Methods ). Set the multimeter to read voltage. Multimeters are designed to test different parts of a circuit to locate the problem. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? they turn on the relay. Please consider supporting us by disabling your ad blocker. Connect a jumper wire between one wire end and the car frame. Determine relay number and pin out Connect 12 V supply to Control pins on the relay and listen for a physical click (Gross Test). Remove the relay and locate its control and power terminals. Polarity doesn't matter on this 4-pin relay, but it is vital on diode relays. 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. 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). 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. If they are the same or close, the wire is fine. Follow, © Copyright 2020, All Rights Reserved 2012-2020 by. Position the relay on the floor, counter or table so the "s" and "m" terminal are facing down. We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. 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). Pull off the wire-wound relay with needle-nose pliers. These failures can cause both short circuits and open circuits---both of which render the wires unusable. 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. Connect the probes to either end of the wiring connectors, the meter with show the resistance in the connection. Shut off the device and set your multimeter to the ohm setting. 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. Step 1: With the relay in any position, check if there is continuity between terminals 1 and 2 of the relay. 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). 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. How to Test a Relay? Disconnect the wires at their corresponding components at both ends using a screwdriver. This test is performed to examine the coil condition (open or closed or shorted turns). Therefore the ‘multi’-‘meter’ or several dimension name. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! 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. Place the meter's test wires across the power and control terminals. 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. The operation is same as above while testing AC Controlled solid State Relay. 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. Your email address will not be published. The ignition relay is the bridge between the battery and the fuel system. 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. Using a 4 pin relay for our example, we must first identify the pins. To test relay coil using multimeter put a multimeter on ohmmeter settings, and measure resistance between coil contact. if the bulb lights, it means the relay is working. Step 4. Use these tips to learn how to test a 4 terminal relay. The hardest part of fixing a wire involves locating the defective one---a process with which a multimeter can help. Nov 14, 2015 - Here is a video on how you can test a Relay with or without a diagram. Consult an auto manual for the correct voltage needed at the device to which you originally connected the wires. 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. 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. Keep the multimeter in the continuity check mode. 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. The idea is to have none. 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. If not, a short has occurred in the wire, and it requires replacement. Connect a 100W bulb at the load side with 110V or 220V AC at terminal “1” and “2”. Turn your multimeter on and set it to the ohms setting. Now, Switch ON and OFF the “ON/OFF Switch”. No continuity should register. NO terminal remains open until the relay activates. If there is not, change the relay. By far, the easiest way to test a suspect fuel pump relay — or some other automotive relay — is to swap the suspect relay … A good relay has NC terminal resistance of 0 Ohm when deactivated & infinite resistance when activated. For that, we need a relay datasheet, in which all relay detail described. You can find its datasheet online by using the model number usually written on its protective case. 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 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. He started writing articles in March 2009, which have appeared on Autos.com and CarsDirect.com. The Fastest Way to Test a Fuel Pump Relay or Other Automotive Relays. However, when the relay is supposed to be activated, I suddenly get a 5v reading. How to Test a Capacitor by Digital & Analog Multimeter ? And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. 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. You need to know about the nominal value of the coil resistance from its datasheet. 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 there is no information about its terminals then you can identify it using an Ohmmeter. Your email address will not be published. This problem occurs due to exceeding the input voltage of the coil. 2. The coil generates a magnetic field which attracts a movable lever (pole) to change the switch position. However, most of the time the resistance of the coil lies beneath 400 ohms. Connect the positive wire to the positive red probe, and connect the black probe to a metal part of the car frame. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? 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. The NC terminal remains closed until the relay activates. Find the "s" and "m" plug-type terminals and the "L" slip-on terminal. Remember, do not use this method unless you have got the technical skills of using a power source taking the necessary safety precautions. – NPN & PNP, Testing Electrical and Electronics Components and Devices with Multimeter, How to find The value of Burnt Resistor ( By three handy Methods ). Reconnect all of the wires except for the wires connecting to the end equipment. 25% Off on Electrical Engineering Shirts. Now take your voltmeter and switch it to ohms. Repeat this process for each wire. 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”. If the meter reads "Open Circuit" or some other very high reading, the wire is bad and requires replacement. Each circuit uses electrical wires to carry both power and signal information to other components. So it is crucial to test a relay if it stopped working before you replace it or throw it away. With the coil still energized, jump battery positive to one switch terminal. Remember, do not use this method unless you have got the, This test ensures the connectivity between the. 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. How to Calculate the Battery Charging Time & Battery Charging Current – Example, How To Calculate Your Electricity Bill. Still, you can troubleshoot the sensor using a digital multimeter (DMM), whether your engine uses an inductive or Hall effect type sensor. Probe the main wire leading from the relay with the test light. ; If the multimeter does not beep, the coil is open & damaged.The relay needs to be replaced. 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. NC and NO pin. 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. Related Post: How to Test a Diode using Digital & Analog Multimeter? If the meter does not show any sign of continuity, the relay conductors are damaged. When the ignition relay is faulty then the battery power is still drawn by the ignition system even after turning off the ignition. 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. But you will have to provide AC Control Voltage instead of DC as shown in fig below. The main purpose of this test is to check the continuity of the coil. Get Free Android App | Download Electrical Technology App Now! General and most common faults found in starter relay are at: i) Coil: (conditions- burnt coil, broken connection) William Kinsey lives in Concord, N.C. Then, open your vehicle's hood and find the fuse panel. 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. Once the relay has been identified, gently grasp or touch the relay in question, have a helper turn the … Disconnect the wires at their corresponding components at both ends using a screwdriver. Checking SSR & Coil Relays. You will find the resistance of the relay coil. Check for discontinuity between N/O contacts and … Electric Phase or Line Tester – Construction & Working of Mains Tester. The purpose of testing a relay is to find, whether it is good or bad . The needle should move to the far left on the analog multimeter and “1” on the digital meter. In this article, we will show you “how to test a relay“. 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… – NPN & PNP. To test a relay, you need to have a multimeter or an ohmmeter. Choose the most convenient. Step 4 - Test the Relay. Insert the multi-tester with one probe on each of the "s" and "m" terminals. Testing the Inductor Test the inductor by connecting the leads from your multimeter to the two ends of the inductor. In this reading .6 is … Copyright 2020 Leaf Group Ltd. / Leaf Group Media. This test ensures the connectivity between the common terminal & the NO (normally open) terminal. According to the schematic given below, If light bulb ON when you close the switch and “OFF” again by opening the switch. In this case, the meter should read "Open Circuit." Do the test with a multimeter Electromechanical Relay EM. IV. Usually, the terminals are specified on the protective cover of the relay. The ohmmeter measures resistance in Ohms (Ω). It doesn't matter which probe is placed on which terminals. 1 below shows the basic wiring diagram for testing a DC input solid state relay. In this post, I am going to teach you how to test a relay with a multimeter . Using a multimeter The only tool required to check a relay is a multimeter. field which attracts a movable lever (pole) to change the switch position. Unfortunately, if you test a relay using this continuity method it will not reveal any turns of the coil that has been shorted. Write down the voltage reading. Rotate the multimeter knob to the “Diode Test Mode” as shown in fig below. It should read “00” or show a very low reading if continuity is present. Check for continuity between the N/C contacts and pole. This will test the resistance in the wire if any. How to Check a Transistor by Multimeter (DMM+AVO) ? It controls a circuit using a very low current that energizes the coil. How To Test A Relay With A Multimeter. 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Of pins, on which terminals min & max limits are specified on the meter... *, all about Electrical & Electronics Engineering & Technology Store - Shop now,... Max limits are specified in its datasheet online by using the model number usually on! In its datasheet online by using the model number usually written on its protective case s '' and m... Ssr ( solid state relay meter with show the resistance of the relay coil is connected probe on of! Not reveal any turns of the wires at their corresponding components at both ends a! Teach you how to test a relay datasheet, the current will only flow from common terminal & the (! With Examples, how to find, whether it how to test a 4 pin relay with a multimeter good as otherwise! Check if there is continuity between the common terminal & the no normally. Configuration like a number of pins, on which terminals coil that been! Zero resistance remove the jumper wire, and retest the wire, and it requires replacement in (. 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