We know that most of the high end industrial application devices have relays for their effective working. Tracking down a loose wire or a ground that isn't grounding can be a pain in the neck. If it does not, look for a break in the wiring between the unit and the fuse box. If the tester lights, test between the terminal marked L and the earth. However, a thermal flasher could not care less if those 2 wires were reversed, so when they hooked up the wire harnesses, they didn't check (nor care) if those 2 wires were correctly hooked up to the flasher socket. Relays are If the resistance value is around several MΩ , the NO terminal is working fine. The test light will be on. When you find this, loosen and retighten the ground connection. Again, the best way is to measure the resistance between them. If the supply side of the unit is working, the bulb should light. Led Turn Signal Flasher Wiring Diagram 4 Way Flashers Relay Within from 3 prong flasher wiring diagram , source:hbphelp.me TheSamba Type 2 Wiring Diagrams from 3 prong flasher wiring diagram , source:thesamba.com Led Turn Signal Flasher Wiring Diagram 4 Way Flashers Relay Within from 3 prong flasher wiring diagram , source:hbphelp.me The voltage is received on the circuit labeled with the number 2 of the Black turn signal switch connector. You can find this in your car's owner's manual. The bulb will now illuminate when the relay is use, and will go out to signal a failure. Probe the main wire leading from the relay with the test light. Connect the clip of the test probe to any good ground. Each part should be placed and linked to other parts in specific way. 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. Troubleshooting your turn signals isn't tough. If your turn signal doesn't light up at all or doesn't flash, it can often be a bad ground connection that's the culprit. The First Step Is To Test The Coil of Relay The lamp should light; it may flash. But let's get to it. Turn signal problems and diagnosis can get confusing, especially when a system shares wires and connections with the parking, warning, and braking light systems.. For example  if the resistance is 320Ω and the tolerance value is ±10% , then we should get resistance values somewhere between 288Ω to 352Ω. Locate your relay cluster. This should also be in your owner's manual. If it's not, you can consult a. After this connect the multimeter’s probe leads to both the terminals of the ohmmeter. If the resistance value is around 0Ω , the NC terminal is working fine. I am Sasmita . Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. The three prong flasher does the same except an extra contact is made available to feed an indicator light on the switch. If not, the structure won’t work as it ought to be. In the datasheet you will also get the tolerance value of the coil. Once you can see your relays, remove the old turn signal flasher relay and replace it with the new one. In this article, we will show what resistance readings you should get when you measure various points of a relay. Place one of the multimeter probes on the NO terminal and the other on the COM terminal. How to Test a Dryer Start Switch. Posted: Fri, Apr 02 2004, 10:03 pm Post subject: 2 prong vrs 3 prong signal flasher Hi, I have a two prong flasher that I temporarily hooked up to flash a 12 volt bulb works ok. If you get very high resistance , to the tune of several MΩ, then the NO terminal is also working fine. if the bulb lights, it means the relay is working. The old style add on signal system I just got shows a flasher with 3 terminals +, L, P, Maybe someone can explain the differance and what the extra terminal is for ? The only thing that you can do now is to replace the relay. I am providing below, the step by step guide to test the NC terminal. So the average car owner can troubleshoot these faults with the use of a test light and, sometimes, a digital multimeter (DMM). Automotive test lights are available at … Helpful Information. In other words, you’re going to power your turn signals directly from your battery for testing. If the signal blinks really fast, you have a bulb out on that side. For testing circuit labeled with the turn lights, and switches the Black turn signal relay, you ever. The same except an extra contact is made available to feed an indicator light the... 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