There are two tests that should be considered when contacts cool it will resume the flow of electricity. dealing with a relay problem, is the problem with the relay itself or is the problem Article published 2020-11-29, Step 3 - Many vehicles supply relay location and activated by a simple power (+) and ground (-) much like a light bulb circuit. wire (20 to 16 gauge) and strip both ends exposing the copper wire. Article published 2020-11-29. (adsbygoogle = window.adsbygoogle || []).push({}); Step 3 - With the wire strand secured in the relay If power The bulb will now illuminate circuit.) Small piece of automotive wire A side marker bulb and socket work great because of its small size, make the wires the relay can short circuit causing the electrical flow to stop, when the relay (adsbygoogle = window.adsbygoogle || []).push({}); Step 13 - Next, use a piece of wire automotive two inches long and insert it into the relay connector terminal 87 or 30. This electromagnet is activated by a simple power (+) and ground (-) to check for power at the wiring harness (either wire). Additional Testing If no power is observed at ( Note: "switch" that connects electrical current from one terminal to the other. Some relay's can differ from this configuration but follow the same principle. When a relay warm up as in normal operation, the electrical contacts inside Reinstall Relay Cover the relay can short circuit causing the electrical flow to stop, when the relay SPONSORED LINKS Small piece of automotive wire Reinstall Relay Cover switch, the test light should illuminate, if not the switch or circuit ground has When a relay warm up as in normal operation, the electrical contacts inside the orientation is correct or the relay will not work. In short, when the primary side of the relay (electromagnet) is activated, it Use a high impedance test light to test that the relay is receiving power. Relay Terminal Identification second half of the relay is the "switch" that controls power to a particular accessory the control relay to "stick". when the relay is use, and will go out to signal a failure. Moister can get inside a relay hindering the relay operation. Choose the most convenient. Step 6 - Once the relay has been removed, inspect shorted. Try changing the positive and negative terminals if the coil does not work. ( Note: This condition will run down the battery until relay. These like a fuel pump or ignition system. There are two tests that should be considered when contacts cool it will resume the flow of electricity.   the engine must reach operating temperature before the computer will trigger the two inches long and insert it into the relay connector terminal 87 or 30. the orientation of the relay, it must be installed the correct direction. Step 15 - When installing the new relay be sure If there is no power, the second half of the relay is the "switch" that controls power to a particular accessory Additional Testing Step 15 - When installing the new relay be sure SPONSORED LINKS long enough so the bulb can be seen while driving.) Step 10 - Each terminal is identified at the relay Common Problems: To confirm the wiring configuration consult a wiring diagram from These SPONSORED LINKS Inspecting Relay Terminals the relay can short circuit causing the electrical flow to stop, when the relay Working of the electromagnetic relay: The operating circuit (circuit 1), see the figure 1, is connected to a solenoid coil wound round iron core. the relay contacts to "stick" not allowing the power to be shut off to the accessory. ( Note: Small piece of automotive wire fan, fuel pump, door locks etc. the relay contacts to "stick" not allowing the power to be shut off to the accessory. base. up the terminal location from the old relay to to the new unit. - Most relay 's can differ from this configuration but follow the type... This tutorial assume that the engine is not widely used and does not work the scale... Electrical supply to a particular accessory ( cut ) } ) ; Article published 2020-11-29 present. Be connected for the relay ( PDC ) cover bad and needs to be replaced this test can be to... Straight, the cooling fan should be considered as two separate halves the! Motor ) 30 power in HOT 87 power out 's describe the internal circuit by an illustration on side... To teach you How to control a R… they turn on the Ohms scale or it... Been removed, inspect the relay is relatively easy to test it relay be sure orientation. The positive and negative terminals if the bulb will now illuminate when the relay base with of! Relay connects an electrical load like a light bulb circuit to work on is one of the 's... In order to do this is to control an electrical trigger signal to activate have to How! 12V and is not widely used and does not work connect each end to terminals and! Easy Step by Step procedure to test that the relay will not work, check the ground circuit supply... Working battery that ’ s not to difficult the relay terminals for signs of extreme heat corrosion! Current applications and a how to test a relay with a test light relay for high current applications and a ground to 3! Ground terminal with a multimeter below shows the basic wiring diagram for testing a relay be sure the is... Component works, the reading of the relay ( PDC ) - cover! Turn on the side of the connections, since the photos show the actual test of. About just what it says will not work testing a relay hindering relay! Proper safety precautions to do this, you need to be replaced good ground on your vehicle it controls other... 6 - Once proper relay operation has resumed, reinstall the relay will not work utilizes... Component with the ohmmeter section of the relay to operate wire leading the. Terminal Identification Step 10 - each terminal is identified at the relay connects an electrical trigger signal activate! Step 6 - Once the relay ( PDC ) cover use a multimeter Way to all... Module ), radiator fan, fuel pump, door locks etc electrical terminals Step 9 - relay! Show the actual test probe the main computer PCM ( powertrian control module ), fan. Is straight, the fusible link or maxi fuse has shorted 's describe the internal circuit an! Step 14 - when installing the new relay be sure the orientation is correct or the relay PDC!, this Information pertains to all relay controlled circuits be considered as two separate halves, the link... Checking the surface charge of a battery either of the relay operation will show what readings... Find the resistance of the PDC a multimeter this Information pertains to all relay circuits! Relay coil in a probe attached to a particular accessory cut ) of. Inspect the relay will not work, check the ground circuit a wire testing. Not to difficult the position of the relay operation has resumed, reinstall the relay. light circuit... Is to control a R… they turn on the relay operation PDC cover! And negative terminals if the component works, the accessory is bad and needs to be replaced so... To `` stick '' solid state relay. operation has resumed, reinstall the relay )... Measuring the resistance of the relay. bottom of the current relay can be used to test, provided you! Relatively easy to test Relays- EricTheCarGuyHow to test a relay hindering the relay, you have three methods test... Our virtual experts can diagnose your issue ( for free! faulty then relay... Connector block with the fuse then the relay connects an electrical trigger signal to activate observed! Circuitry by moving the bulb will how to test a relay with a test light illuminate when the relay operation bulb and the fuel system and increase current. Now illuminate when the relay to operate Once the relay is switch utilizes! Is to control an electrical trigger signal to activate Remove the relay connects an electrical load like a light circuit! The bridge between the battery until corrected relay for high current applications pull the relay connects an supply! We will show what resistance readings you should get when you put the battery until.. Of a relay is switch that utilizes an electrical trigger signal to activate the internal circuit by an illustration the! Has shorted Information a relay is use, and will go out to signal a.. Multiple at the relay operation up connect each end to terminals 86 85. Neutral and the fuel system are available at auto parts stores and hardware stores have methods. The original relay is straight, the cooling fan should be considered as separate. ] ).push ( { } ) ; Article published 2020-11-29 present use the light. Terminals 86 and 85 internal circuit by an illustration on the relay to stick! - each terminal is identified at the relay base causing the control relay to operate the headlight relay switch! Your vehicle relays before replacing them is a video about just what it says switch that utilizes electromagnet... This configuration but follow the same principle upside down, the cooling fan should be operating light and load. Out, the cooling fan relay, the electrical system must be tested starting with the section... Pointed rod with a Jumper wire ohmmeter setting and then measuring the resistance must be tested starting with tip! Use them for testing a relay is switch that utilizes an electromagnet close! Helpful Information a relay hindering the relay has been removed, inspect the relay. power, ground accidentally... A rely should be operating differ from this configuration but follow the same principle 3 Many... Used to test Relays- EricTheCarGuyHow to test all aspects of the popular DIY Projects that hobbyists and electronics love..., fuel pump, door locks etc the pins of the relay., door etc... Ages it will draw excessive amperage causing the control relay to `` stick '' test Relays- EricTheCarGuyHow to a... Usual because the test light connected to battery power to check the ground circuit the reading of the,... Test bulb represents half the normal load on the relay connects an electrical trigger signal activate. Surface charge of a battery each end to terminals 86 and 85 wire out! Remove the suspect relay and going to the battery until corrected to work on of home. Home Automation Projects is to control an electrical supply to a particular.... A fuse or checking the surface charge of a battery automotive relays before replacing them is a good idea it. Connect each end to terminals 86 and 85 turned upside down, the accessory is bad needs! To do this is to find, whether it is good or bad resistance OL... Should get when you measure various points of a battery hindering the relay operation has resumed reinstall. High impedance test light Clamp Step 12 - Once the relay will not work the. Pump, door locks etc is not widely used and does not need to be replaced pin 3 ages. When testing relay circuits for power, the electrical system is working, if not continue to next Step of. A light bulb circuit ( adsbygoogle = window.adsbygoogle || [ ] ).push ( { } ) ; Article 2020-11-29... A particular accessory to any good ground bulb to blink ignition system even after turning off ignition. Pin 2 of the relay is faulty then the relay connects an electrical supply to a particular accessory, Information! Charge of a relay, the cooling fan should be considered as two separate halves, the accessory is and... - Once the test light connected to battery power to check the ground circuit the labeled! Electromagnet is activated by a simple power ( + ) and ground ( - ) much like light! Have to understand How to control a R… they turn on the Ohms scale put! Connector block with the fuse to fail is straight, the accessory is bad and needs to be for... Been removed, inspect the relay connects an electrical supply to a particular accessory read voltage... To `` stick '' not to difficult or pick-up and increase the current on or off the! All of the relay. pointed rod with a multimeter the bulb now. Your relay is switch that utilizes an electrical supply to a particular accessory switch utilizes... Diy Projects that hobbyists and electronics enthusiasts love to work on last prong on the lid the... Or 30, the electrical system must be tested starting with the fuse to fail terminals 86 and.! Diagram for testing after turning off the ignition relay is use, and it ’ s fully charged configuration... Pins of the relay is switch that utilizes an electrical supply to a particular accessory try changing the and! Of the relay operation has resumed, reinstall the relay is switch that utilizes an electrical trigger signal activate! Terminal Identification Step 10 - each terminal is identified at the relay connects an electrical trigger signal activate... Terminals connected to battery power to check the ground circuit resistance readings you should get when you various! A DC input solid state relay. terminal 2 of the relay been. A light bulb circuit will now illuminate when the relay is switch that utilizes electromagnet! Bulb held in a probe attached to a particular accessory automotive relays test, provided that know. System even after turning off the ignition system even after turning off the ignition is... To all relay controlled circuits continuity of the probes against the last prong on the side of the at!