Testing the Inductor Test the inductor by connecting the leads from your multimeter to the two ends of the inductor. 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. 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. The coil generates a magnetic field which attracts a movable lever (pole) to change the switch position. If the meter does not show any sign of continuity, the relay conductors are damaged. Once you locate the relay, you have three methods to test it. Over time, these wires can become damaged due to misuse, accidents and component failure. it's pin configuration like a number of pins, on which pin relay coil is connected. And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. 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. However, most of the time the resistance of the coil lies beneath 400 ohms. By far, the easiest way to test a suspect fuel pump relay — or some other automotive relay — is to swap the suspect relay … If not, a short has occurred in the wire, and it requires replacement. Determine relay number and pin out Connect 12 V supply to Control pins on the relay and listen for a physical click (Gross Test). The operating input parameter’s min & max limits are specified in its datasheet. – NPN & PNP, Testing Electrical and Electronics Components and Devices with Multimeter, How to find The value of Burnt Resistor ( By three handy Methods ). 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. General and most common faults found in starter relay are at: i) Coil: (conditions- burnt coil, broken connection) if there is no information about its terminals then you can identify it using an Ohmmeter. How to Calculate the Battery Charging Time & Battery Charging Current – Example, How To Calculate Your Electricity Bill. Fig. Keep the multimeter in the continuity check mode. – NPN & PNP. The idea is to have none. 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. In this case, the meter should read "Open Circuit." Do the test with a multimeter Electromechanical Relay EM. Disconnect the wires at their corresponding components at both ends using a screwdriver. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! eg. Disconnect the wires at their corresponding components at both ends using a screwdriver. Insert the multi-tester with one probe on each of the "s" and "m" terminals. Then, open your vehicle's hood and find the fuse panel. A relay usually gets damaged due to a number of reasons. Related Post: How to Find the value of SMD Resistors. If the resistance is very low or very high, the coil most likely has short turns or opened respectively. Consult an auto manual for the correct voltage needed at the device to which you originally connected the wires. Multimeters are designed to test different parts of a circuit to locate the problem. It controls a circuit using a very low current that energizes the coil. NO terminal remains open until the relay activates. How to Test & Fix the Printed Circuit Board (PCB) Defects? The ohmmeter measures resistance in Ohms (Ω). The NC terminal remains closed until the relay activates. This is the easiest and accurate way to check and troubleshoot an SSR (Solid State Relay). He also currently owns and operates Sophisticated Curves, an online fashion mall that caters to the needs of plus size women. Shut off the device and set your multimeter to the ohm setting. 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”. You will find the resistance of the relay coil. If there is not, change the relay. Use these tips to learn how to test a 4 terminal relay. If the measured resistance matches the resistance mentioned in its datasheet, the relay coil is fine. Find the "s" and "m" plug-type terminals and the "L" slip-on terminal. Compare the measured reading with the ideal voltage as prescribed by the manual. The operation is same as above while testing AC Controlled solid State Relay. This will test the resistance in the wire if any. Our website is made possible by displaying online advertisements to our visitors. Usually, the terminals are specified on the protective cover of the relay. William Kinsey lives in Concord, N.C. If the meter does not beep at all, it is probably the conductors inside are broken. Rotate the multimeter knob to the “Diode Test Mode” as shown in fig below. 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. So it is crucial to test a relay if it stopped working before you replace it or throw it away. Once the relay has been identified, gently grasp or touch the relay in question, have a helper turn the … You can also check it using an Ohmmeter. Limited Edition... Book Now Here. 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. 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. Polarity doesn't matter on this 4-pin relay, but it is vital on diode relays. 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. Connect a 100W bulb at the load side with 110V or 220V AC at terminal “1” and “2”. He started writing articles in March 2009, which have appeared on Autos.com and CarsDirect.com. Step 1: With the relay in any position, check if there is continuity between terminals 1 and 2 of the relay. Get Free Android App | Download Electrical Technology App Now! For that, we need a relay datasheet, in which all relay detail described. These failures can cause both short circuits and open circuits---both of which render the wires unusable. 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. If the meter reads "Open Circuit" or some other very high reading, the wire is bad and requires replacement. One thing commonly tested on heavy-duty trucks is the 5-pin relay. Reconnect all of the wires except for the wires connecting to the end equipment. In this reading .6 is … Related Post: How to Test a Diode using Digital & Analog Multimeter? 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)).
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