lokzracing Posted October 28, 2016 Report Share Posted October 28, 2016 I have a 71 510 2door and when I turn on my headlight they won't turn on but my rear tail lights will?? Quote Link to comment
Lockleaf Posted October 28, 2016 Report Share Posted October 28, 2016 Have you confirmed that your lights are good? 1 Quote Link to comment
Draker Posted October 28, 2016 Report Share Posted October 28, 2016 Get out a meter and check for voltage at the lights. Trace it back the headlight relay.. and back to the switch. You'll fine the issue. It's quite possible both your headlight fuses are blown .. or there is a bad connection in the fuse box. All too common... Swap some fuses around.. check for power. Get a test light and probe around. Quote Link to comment
datzenmike Posted October 28, 2016 Report Share Posted October 28, 2016 Front and side marker, dash, tail and license plate lamps are separate from the headlights. Find the headlamp relay, set turn signal lever to low beams and turn the headlamps on. You should hear a click from the relay. No click... probably no ground. If neither Hi or Lo are working I would expect the ground at the headlamp relay. The headlamps have a fuse for each side and unlikely both are blown at the same time. The ground is common to both. Ground is the Black wire on the relay. Make a jumper and ground the Black wire. If the low beams come on this is the problem. 1 Quote Link to comment
datzenmike Posted October 28, 2016 Report Share Posted October 28, 2016 Get out a meter and check for voltage at the lights. Trace it back the headlight relay.. and back to the switch. You'll fine the issue. It's quite possible both your headlight fuses are blown .. or there is a bad connection in the fuse box. All too common... Swap some fuses around.. check for power. Get a test light and probe around. Power is fed to two fuses in the fuse box from the headlamp switch. From the fuses to the left and the right high and low beams. All headlamps have power to them with the headlamp switch on. The high and the low beams are selected by by grounding the other side of the lamps through the headlamp relay. Power does not go to the relay it goes to the lamps. Grounding the lamps turns them on. 1 Quote Link to comment
Draker Posted October 28, 2016 Report Share Posted October 28, 2016 Yeah, I was just brain dumping. I didn't look a the wiring diagram.. regardless thanks for clarifying. 1 Quote Link to comment
datzenmike Posted October 29, 2016 Report Share Posted October 29, 2016 It could very well be the fuses, I just thought it unlikely two would be blown at the same time but forgot about the poor shape a 45 year old fuse box can be in. Definitely check fuses and for power on the RED wire on the right side lamp socket and the RED/BLUE wire on the left headlamp socket. If you have power to the lamps it needs a ground on the other side to light up. Quote Link to comment
lokzracing Posted October 29, 2016 Author Report Share Posted October 29, 2016 Yes both lights are good and brand new and relay click when try to turn on. And are all Grounded good. I will follow all wire to see what I can find 1 Quote Link to comment
datzenmike Posted October 29, 2016 Report Share Posted October 29, 2016 Relay clicks then ground is good. Check the fuses... Power from the battery to the light switch. From the switch to TWO fuses From each fuse to L or R headlamps Headlamps to relay which grounds hi or lo. 1 Quote Link to comment
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