If not, check the wiring between the isolation relay and headlight relay. How to Check That Power is Getting to the Headlights: Use a Test Light. Do you. Disconnect the single connector with the blue wire. have the same problem? Test light; Small piece of automotive wire; Small automotive bulb and socket Common Problems: When a relay warm up as in normal operation, the electrical contacts inside the relay can short circuit causing the electrical flow to stop, when the relay contacts cool it will resume the flow of electricity. Check the switch for that mode. Step.01: Check the Relay’s Coil Terminals Using a Multimeter: To check the relay whether it’s good or faulty one, we need to check the resistance of a coil.In the Relay, there is a coil and that coil has some resistance, using that resistance knowledge we can find that the relay is a good one or not. IMHO, if the relay was chattering under load, it would last about 1 to 2 months.I would be looking for a loose connection, one thing for sure, my first test, you should here a definite clicking, if you do, and no headlight, that would indicate the contact is blown away--AKA need a relay.Unfortunately that relay assembly is just that a assembly. You may need to consult your vehicle repair manual to locate the relay you need to test. Set the meter to the 20-volt DC scale. Check for constant ground. If you do not find a blown fuse have some one to turn the key on and turn on the high beam lights> During this time locate the low beam headlight relay and place your finger on top of relay, have the other person to switch from high beam to low beam lights. Where is the relay for my right head light located? Starter relay works, headlight relay dead. Turn on the headlights. If you find a blown fuse, then replacing it may fix the problem. HMAC300 EXPERT; There is only high and low beam relays check fuses five and six under hood fuse box. The driver should check the wire connection and tighten it if loose, or replace it if corroded or otherwise damaged. Check if there is 12V between pink and black with the headlight switch in the "on" position. Trying to check the right headlight relay, but I cannot find it. [Have a service manual that says all how to do this.] A headlight relay switch may malfunction due to a loose or faulty electrical connection to the coil, which generates a magnetic field when voltage is applied. Also determine which wire goes to the parking lamps and the headlight relay. Check the relay for that mode. The first, and easiest, component to check is the headlight fuse. Yes. Check the fuse/relay panel for a blown fuse controlling the low beam lights. Relay and Horn Circuit RepairOur '69 Barracuda is an example of how to trace the cause of a malfunctioning relay circuit. The manual said - terminal pins 7 & 8 will close (zero ohms resistance) when headlight relay activates. I tried jumpering these pins (to simulate the relay clicking on) and the headlight still did not come on. This is the question. Testing Fuses, Relays, Switches, and Other Headlight Circuit Components . Unplug the light bulb electrical connector. Thursday, February 9th, 2017 AT 8:07 PM. The side going to the relay (blue) must carry 12V measured to ground if the headlight switch is in the "off" position. Depending on how your headlight circuit is set up, there may be one fuse or multiple fuses for the headlights. Now when I hook the motor leads up to the relay and turn key to on position turn headlight switch on the motor seems to lift the covers all the way and then by that point the relay has pulled in and is holding but it arcs and makes a buzzing noise. Locate a source of power on your wiring diagram and probe that wire with the positive lead of the multimeter. No. 1 Reply. 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