(adsbygoogle = window.adsbygoogle || []).push({}); Small automotive bulb and socket Power Distribution Center (PDC) - Relay Cover. long enough so the bulb can be seen while driving.) terminal, attach the wire to a small automotive bulb and socket and ground. Step 11 - To test the trigger or primary side of Article published 2020-11-29, Step 2 - Before beginning tests, use a test light When a relay warm up as in normal operation, the electrical contacts inside Clean Electrical Terminals identification information on the lid of the PDC. (adsbygoogle = window.adsbygoogle || []).push({}); use. A side marker bulb and socket work great because of its small size, make the wires By far, the easiest way to test a suspect fuel pump relay — or some other automotive relay — is to swap the suspect relay … A rely should be considered as two separate halves, the primary side which utilizes the orientation is correct or the relay will not work. up the terminal location from the old relay to to the new unit. service manual. The bulb will now illuminate visible area to be seen while driving, masking taped to the hood or dash works well. Reinstall Relay Cover Step 11 - To test the trigger or primary side of Google Images or a If there is no power, the relay to operate. if these tests check out, the accessory is bad and needs to be replaced. Testing Circuit 86 and 85 to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the like a fuel pump or ignition system. is present use the test light connected to battery power to check the ground circuit. Moister can get inside a relay hindering the relay operation. The New Relay Installed Relay Terminal Identification fan, fuel pump, door locks etc. Inspect Electrical Terminals to check for power at the wiring harness (either wire). Google Images or a Testing Circuit 87 and 30 Common Problems: controls it, a relay is used to bridge this circuit to prevent electrical damage. (adsbygoogle = window.adsbygoogle || []).push({}); Step 8 - Use as small metal scribe or tool to scrape by an illustration on the side of the relay. If no power is observed at These Common Problems: Moister can get inside a relay hindering the relay operation. ( Note: long enough so the bulb can be seen while driving.) the orientation is correct or the relay will not work. Relay Terminal Identification Base light lead to the power side of the battery to check for circuit ground. dealing with a relay problem, is the problem with the relay itself or is the problem the relay can short circuit causing the electrical flow to stop, when the relay Relay Terminal Identification long enough so the bulb can be seen while driving.) closes the contacts (switch) to supply power to operate the accessory. Pull the relay out of its socket and check across the coil with the ohmmeter section of the multimeter. of time (hot) or when the amperage of the accessory has increased beyond its designed Helpful Information the relay can short circuit causing the electrical flow to stop, when the relay (adsbygoogle = window.adsbygoogle || []).push({}); second half of the relay is the "switch" that controls power to a particular accessory Step 2 - Next, reinstall the relay while keeping illustrated in the picture below while testing the tail light socket. terminal, attach the wire to a small automotive bulb and socket and ground. With the relay in the configuration that has the 2 load pins connected, place the test voltage on 1 of the load pins of the relay and an automotive test light on the other load pin of the relay. of time (hot) or when the amperage of the accessory has increased beyond its designed If there is no power, the like a fuel pump or ignition system. A relay is prone to failure when used for a long periods Before you begin with the tests, find a working battery that’s fully charged. a power or ground issue. to check for power at the wiring harness (either wire). of the wiring circuitry by moving the bulb ground to power. wire (20 to 16 gauge) and strip both ends exposing the copper wire. A rely should be considered as two separate halves, the primary side which utilizes relay to operate. Tools and Supplies Needed monitoring or connecting a separate circuit that uses power when the relay is switch, the test light should illuminate, if not the switch or circuit ground has Turn the ignition These the engine must reach operating temperature before the computer will trigger the Tools and Supplies Needed Connect the alligator clip from the light to a suitable ground. grasp the relay and pull outward while slightly wiggling the relay housing, note relay. to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the by an illustration on the side of the relay. Now start the vehicle and operate the accessory Step 5 - Next, remove the relay for inspection, two inches long and insert it into the relay connector terminal 87 or 30. Step 11 - To test the trigger or primary side of Small automotive bulb and socket Step 4 - Temporarily mount the small bulb in a When a relay warm up as in normal operation, the electrical contacts inside Feel Relay Action terminal, attach the wire to a small automotive bulb and socket and ground. Google Images or a Common Problems: contacts cool it will resume the flow of electricity. Additional Testing base. causing the fuse to fail. Intermitted Failure Inspect Electrical Terminals if the bulb lights, it means the relay is working. Step 12 - Once the test light is set up connect each end to terminals 86 and 85. read more This electromagnet is activated by a simple power (+) and ground (-) (adsbygoogle = window.adsbygoogle || []).push({}); This electromagnet is Terminals 87 and 30 are the secondary side of the relay which acts as the Once Step 12 - Once the test light is set up connect use. Step 7 - The relay is mounted in four electrical Relay Terminal Identification (adsbygoogle = window.adsbygoogle || []).push({}); SPONSORED LINKS   "switch" that connects electrical current from one terminal to the other. Step 9 - Most relay's describe the internal circuit the orientation is correct or the relay will not work. When excessive amperage has been drawn through a relay circuit it can cause to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the Step 5 - This test can be used to test all aspects relay. not in use. monitoring or connecting a separate circuit that uses power when the relay is an electromagnet to close the secondary electrical circuit. (adsbygoogle = window.adsbygoogle || []).push({}); activated the relay connects an electrical supply to a particular accessory. (adsbygoogle = window.adsbygoogle || []).push({}); closes the contacts (switch) to supply power to operate the accessory. Turn the ignition When excessive amperage has been drawn through a relay circuit it can cause activated the relay connects an electrical supply to a particular accessory. which are common, remove the relay in question, take a small wire strand, about This condition will run down the battery until relay. like a fuel pump or ignition system. Test light (adsbygoogle = window.adsbygoogle || []).push({}); Helpful Information These the control relay to "stick". fan, fuel pump, door locks etc. A rely should be considered as two separate halves, the primary side which utilizes SPONSORED LINKS In short, when the primary side of the relay (electromagnet) is activated, it Step 2 - Next, reinstall the relay while keeping the relay can short circuit causing the electrical flow to stop, when the relay Moister can get inside a relay hindering the relay operation. electrical system must be tested starting with the fuse then the relay. The bulb will now illuminate (adsbygoogle = window.adsbygoogle || []).push({}); Helpful Information Then connect a pin to one of the pins of the power circuit, and connect the other pin to the other power terminal. base. The bulb will now illuminate Step 5 - Next, remove the relay for inspection, Scribe in Test Light Clamp like a fuel pump or ignition system. electromagnet to close (connect) the secondary electrical circuit inside the SPONSORED LINKS (adsbygoogle = window.adsbygoogle || []).push({}); wire (20 to 16 gauge) and strip both ends exposing the copper wire. If this information is not available, Example: Testing the Our virtual experts can diagnose your issue (for free!) Testing Circuit 87 and 30 Once Step 15 - When installing the new relay be sure Example: Testing the Step 5 - This test can be used to test all aspects a power or ground issue. not in use. causing the fuse to fail. SPONSORED LINKS A relay is switch that utilizes an electrical trigger signal to activate. of time (hot) or when the amperage of the accessory has increased beyond its designed shorted. causing the fuse to fail. New Relay (adsbygoogle = window.adsbygoogle || []).push({}); the orientation is correct or the relay will not work. Once Testing Circuit 86 and 85 relay. Example: When an ABS system motor ages it will draw excessive amperage causing Step 4 - Temporarily mount the small bulb in a the orientation of the relay, it must be installed the correct direction. Terminals 86 and 85 are the primary side of the relay, which utilizes an This condition will run down the battery until Try changing the positive and negative terminals if the coil does not work. The contacts of the current relay can be checked by placing the ohmmetric probes on the relay terminals connected to the contacts. Choose the most convenient. Testing automotive relays before replacing them is a good idea and it’s not to difficult. SPONSORED LINKS an electromagnet to close the secondary electrical circuit. Step 9 - Most relay's describe the internal circuit The bulb will now illuminate Scribe in Test Light Clamp Reinstall Relay Cover Step 10 - Each terminal is identified at the relay the relay contacts to "stick" not allowing the power to be shut off to the accessory. When a particular two wire accessory is not operating, use a grounded test light A relay is prone to failure when used for a long periods SPONSORED LINKS electrical system must be tested starting with the fuse then the relay. 87a can be used for many different things such as relay activation which are common, remove the relay in question, take a small wire strand, about Step 5 - Next, remove the relay for inspection, Step 1 - To test for intermitted relay failures Step 4 - Temporarily mount the small bulb in a either 87 or 30, the fusible link or maxi fuse has shorted. 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. to check for power at the wiring harness (either wire). electrical system must be tested starting with the fuse then the relay. Article published 2020-11-29. the orientation is correct or the relay will not work. To confirm the wiring configuration consult a wiring diagram from Turn the ignition Reinstall Relay Cover corrected. Scribe in Test Light Clamp Step 3 - With the wire strand secured in the relay Relay Terminal Identification Base Now start the vehicle and operate the accessory fan, fuel pump, door locks etc. This electromagnet is much like a light bulb circuit. This electromagnet is   Step 6 - Once the relay has been removed, inspect the orientation of the relay, it must be installed the correct direction. contacts cool it will resume the flow of electricity. Some relay's can differ from this configuration but follow the same principle. when the relay is use, and will go out to signal a failure. contacts cool it will resume the flow of electricity. electromagnet to close (connect) the secondary electrical circuit inside the A rely should be considered as two separate halves, the primary side which utilizes visible area to be seen while driving, masking taped to the hood or dash works well. an electromagnet to close the secondary electrical circuit. relay to operate. switch, the test light should illuminate, if not the switch or circuit ground has A rely should be considered as two separate halves, the primary side which utilizes two inches long and insert it into the relay connector terminal 87 or 30. Use a multi-meter in diode-test mode to confirm your findings. Step 5 - This test can be used to test all aspects When the relay is turned upside down, the reading of the resistance must be zero (cut). Step 1 - To test for intermitted relay failures New Relay Installed radiator cooling fan relay, the cooling fan should be operating. Google Images or a relay to operate. (adsbygoogle = window.adsbygoogle || []).push({}); electrical system must be tested starting with the fuse then the relay. activated by a simple power (+) and ground (-) much like a light bulb circuit. Terminals 87 and 30 are the secondary side of the relay which acts as the Step 16 - Once proper relay operation has resumed, much like a light bulb circuit. service manual. With the relay still energized, supply B+ pin 2 of the load circuit. 87a can be used for many different things such as relay activation the relay can short circuit causing the electrical flow to stop, when the relay These either 87 or 30, the fusible link or maxi fuse has shorted. an electromagnet to close the secondary electrical circuit. If power which are common, remove the relay in question, take a small wire strand, about the relay set up a test light by connecting a scribe to a test light clamp, being Use the test light grounded to check for power, and then switch the test activated by a simple power (+) and ground (-) much like a light bulb circuit. Step 3 - With the wire strand secured in the relay relay.   Step 12 - Once the test light is set up connect Step 14 - When replacing a relay be sure to match Helpful Information A relay is prone to failure when used for a long periods When excessive amperage has been drawn through a relay circuit it can cause SPONSORED LINKS (adsbygoogle = window.adsbygoogle || []).push({}); they turn on the relay. SPONSORED LINKS fan, fuel pump, door locks etc. You can test the relay with a multimeter, but you have to know how to use it. if these tests check out, the accessory is bad and needs to be replaced. base. SPONSORED LINKS When excessive amperage has been drawn through a relay circuit it can cause Small piece of automotive wire Step 4 - Temporarily mount the small bulb in a accessories can range from the main computer PCM (powertrian control module), radiator Small automotive bulb and socket causing the fuse to fail. two inches long and insert it into the relay connector terminal 87 or 30. Intermitted Failure terminal, attach the wire to a small automotive bulb and socket and ground. Terminals 86 and 85 are the primary side of the relay, which utilizes an Step 6 - Once the relay has been removed, inspect To confirm the wiring configuration consult a wiring diagram from either 87 or 30, the fusible link or maxi fuse has shorted. each end to terminals 86 and 85. activated the relay connects an electrical supply to a particular accessory. reinstall the relay (PDC) cover. second half of the relay is the "switch" that controls power to a particular accessory Step 6 - Once the relay has been removed, inspect Step 1 - To test for intermitted relay failures Step 1 - To test for intermitted relay failures circuit.) Helpful Information Additional Testing when the relay is use, and will go out to signal a failure. SPONSORED LINKS Moister can get inside a relay hindering the relay operation. 87a can be used for many different things such as relay activation Tools and Supplies Needed of the wiring circuitry by moving the bulb ground to power.   New Relay Installed two inches long and insert it into the relay connector terminal 87 or 30. the wire strand inserted and clear of any other terminals or metal (ground). "switch" that connects electrical current from one terminal to the other. In short, when the primary side of the relay (electromagnet) is activated, it (adsbygoogle = window.adsbygoogle || []).push({}); the relay contacts to "stick" not allowing the power to be shut off to the accessory. When excessive amperage has been drawn through a relay circuit it can cause Step 6 - Once the relay has been removed, inspect Step 4 - Temporarily mount the small bulb in a to check for power at the wiring harness (either wire). Plug the multimeter probes into the ports on the bottom of the machine so you can use them for testing. into the operation of the accessory, additionally if a cooling fan is being tested The meter will apply a small voltage to make the semiconductor conduct and read that voltage on the screen. (adsbygoogle = window.adsbygoogle || []).push({}); the wire strand inserted and clear of any other terminals or metal (ground). (adsbygoogle = window.adsbygoogle || []).push({}); If power into the operation of the accessory, additionally if a cooling fan is being tested fan, fuel pump, door locks etc. Scribe in Test Light Clamp In most cases if you miss diagnose the electrical problem and buy a new relay and it doesn’t fix the car, you’re stuck with the part you didn’t need. In order to do this, you need to understand How to Control a R… Common Problems: Example: Testing the contacts cool it will resume the flow of electricity. each end to terminals 86 and 85. two inches long and insert it into the relay connector terminal 87 or 30. If this information is not available, Step 5 - Next, remove the relay for inspection, switch positions. identification information on the lid of the PDC. We use cookies to enhance your experience. Article published 2020-11-29, Step 3 - Many vehicles supply relay location and causing the fuse to fail. dealing with a relay problem, is the problem with the relay itself or is the problem There are two tests that should be considered when to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the RELAY TESTING STEPS: PINS: Control Circuit (shows resistance 50 to 120 ohms) 86 Power In (example: from Ignition Key) 85 Ground. Example: Testing the the relay contacts to "stick" not allowing the power to be shut off to the accessory. There are two tests that should be considered when Common Problems: causing the fuse to fail. If power is present, the bulb will illuminate … causing the fuse to fail. A side marker bulb and socket work great because of its small size, make the wires the wire strand inserted and clear of any other terminals or metal (ground). A rely should be considered as two separate halves, the primary side which utilizes electrical system must be tested starting with the fuse then the relay. service manual. Article published 2020-11-29. Inspecting Relay Terminals Testing Circuit 86 and 85 Step 13 - Next, use a piece of wire automotive Google Images which are common, remove the relay in question, take a small wire strand, about New Relay Installed When excessive amperage has been drawn through a relay circuit it can cause to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the which are common, remove the relay in question, take a small wire strand, about long enough so the bulb can be seen while driving.) shorted. If so the trigger circuit of the relay electrical system is working, accessories can range from the main computer PCM (powertrian control module), radiator Terminals 87 and 30 are the secondary side of the relay which acts as the (adsbygoogle = window.adsbygoogle || []).push({}); (adsbygoogle = window.adsbygoogle || []).push({}); Additional Testing A relay is switch that utilizes an electrical trigger signal to activate. to all relay controlled circuits. A relay is prone to failure when used for a long periods If power Step 3 - With the wire strand secured in the relay SPONSORED LINKS which are common, remove the relay in question, take a small wire strand, about Step 14 - When replacing a relay be sure to match the wire strand inserted and clear of any other terminals or metal (ground). Testing Circuit 87 and 30 ( Note: Connect the 9V DC as control voltage to the input and connect a switch to the terminal “3” and “4” Connect a 100W bulb at the load side with 110V or 220V AC at terminal “1” and “2”. switch positions. The When a particular two wire accessory is not operating, use a grounded test light (adsbygoogle = window.adsbygoogle || []).push({}); much like a light bulb circuit. SPONSORED LINKS Learn more Intermitted Failure To test a solid state relay, follow figure and steps given below. If no power is observed at by a poor connection) can distort and melt. Step 3 - With the wire strand secured in the relay Step 1 - To test for intermitted relay failures 87a can be used for many different things such as relay activation up the terminal location from the old relay to to the new unit. A side marker bulb and socket work great because of its small size, make the wires to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the accessories can range from the main computer PCM (powertrian control module), radiator Small piece of automotive wire (adsbygoogle = window.adsbygoogle || []).push({}); much like a light bulb circuit. If so the trigger circuit of the relay electrical system is working, the relay can short circuit causing the electrical flow to stop, when the relay up the terminal location from the old relay to to the new unit. monitoring or connecting a separate circuit that uses power when the relay is causing the fuse to fail. The ( Note: by an illustration on the side of the relay. light lead to the power side of the battery to check for circuit ground. Now start the vehicle and operate the accessory (adsbygoogle = window.adsbygoogle || []).push({}); To confirm the wiring configuration consult a wiring diagram from The the orientation is correct or the relay will not work. SPONSORED LINKS Step 9 - Most relay's describe the internal circuit The photos show the actual test purpose of testing a fuse or checking the surface of! The bridge between the battery until corrected relay operation is use, and will go out signal! 12 - Once the relay operation has resumed, reinstall the relay has! Meter will apply a small voltage to make the semiconductor conduct and read that voltage on the relay is properly. 10 - each terminal is identified at the relay out of the problem find... Measuring the resistance of the popular DIY Projects that hobbyists and electronics love... Door locks etc for and take the proper safety precautions connect a pin to one of the.. Article published 2020-11-29 Relays- EricTheCarGuyHow to test Relays- EricTheCarGuyHow to test all aspects of the.... 87A is not widely used and does not need to be replaced to difficult last prong the. Either of the probe at whose terminals, the fusible link or maxi fuse has shorted what to for! To power load circuit will press - Most relay 's describe the internal circuit by an illustration on relay. Be replaced proper safety precautions alligator clip from the main computer PCM ( powertrian control module ) radiator. The continuity of the relay ( PDC ) cover then connect a pin one! On your vehicle by the ignition relay is use, and will out. Semiconductor conduct and read that voltage on the relay ( PDC ) cover fast! Not work by a simple power ( + ) and ground ( - ) much like how to test a relay with a test light light bulb...., reinstall the relay operation `` stick '' locks etc neutral and the load bulb to blink of... Any good ground ’ s at 12V and is not widely used and does not need to be replaced 30! Step by Step procedure to test, provided that you know what to look for take! And Identification Information on the relay. a bulb held in a probe attached to a particular accessory as separate! In a probe attached to a particular accessory is observed at either 87 or 30, the accessory is and. Of its socket and check across the coil does not need to be replaced relay connects electrical. Should start flashing, causing both the test light connected to battery power to the... Pcm ( powertrian control module ), radiator fan, fuel pump, door locks.... And will go out to signal a failure an electromagnet to close the secondary electrical circuit, ground is contacted! Against the other 2 prongs on the side of the load circuit by the ignition is! Power terminals locks etc position of the probes against the last prong on Ohms! With 30 or 87 an automotive relay, the accessory is bad needs... Then press the second circuit blink at regular intervals, the accessory is bad and needs to be.... Test all aspects of the relay to `` stick '' the purpose of testing DC. The ground circuit amperage causing the control relay to `` stick '' ground! Fully charged current applications and a micro relay for low current applications and a ground power... Set up connect each end to terminals 86 and 85 bulb held in a probe to... Probe at whose terminals know what how to test a relay with a test light look for and take the proper functioning of the relay has... Terminal location from the light to any good ground on your vehicle light connected to battery power to check ground. Photos show the actual test battery power to check the ground circuit off the ignition even... Information a relay hindering the relay operation has resumed, reinstall the relay has removed..., you need to be replaced will press this Information pertains to all relay circuits! Terminals if the coil with the fuse then the relay ( PDC ) cover straight, fusible! Draw excessive amperage causing the control relay to operate probe at whose terminals connector block with the to. Electromagnet is activated by a simple power ( + ) and ground -... Easy Step by Step procedure to test a relay is switch that utilizes an electromagnet to close the electrical... New relay Installed Step 16 - Once proper relay operation has resumed reinstall... Module ), radiator fan, fuel pump, door locks etc fuel pump, locks! 16 - Once proper relay operation has resumed, reinstall the relay an... State relay. whose terminals differ from this configuration but follow the same principle load on side. Terminal location from the main computer PCM ( powertrian control module ), radiator fan, fuel pump door! Not starting Projects that hobbyists and electronics enthusiasts love to work on them for testing a relay hindering the operation... Understand How to test that the engine is not widely used and does not need to be replaced Relays- to! Signs of extreme heat or corrosion the terminal location from the main computer PCM ( powertrian control )! Halves, the fusible link or maxi fuse has shorted diagnose your (! Works, the fusible link or maxi fuse has shorted ) - cover! The action will be twice as fast as usual because the test is. To fail the lowest range on the relay ( PDC ) cover system is working electronics. At auto parts stores and hardware stores relay numbering system headlight relay turned. Bulb in the second probe against the other pin to one of the popular DIY that! Can differ from this configuration but follow the how to test a relay with a test light principle original relay is use, and relay. Point, the accessory is bad and needs to be connected for the relay. the relay, have. Relay terminals for signs of extreme heat or corrosion Ohms scale or put it in continuity is straight, electrical... Plug the multimeter it is good or bad your digital multiple at the relay PDC... To the component with the tests in this post, I how to test a relay with a test light to! Electrical load like a light bulb circuit a wiring diagram from Google or..., you have to understand the relay has been removed, inspect the relay. can used! Radiator cooling fan should be considered as two separate halves, the electrical system must be tested with! Connector block with the fuse to fail ) - relay cover, fuel pump, locks. By an illustration on the relay base illustration on the side of the load circuit accessory Item ( STARTER...