Headlight wiring.

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Sep 12, 2024 | 07:44 PM

Ol' Grouch

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Headlight wiring.

I am in the process of removing a snow plow system from my '99 F-350 Superduty. My left headlight works fine. The right clearance and turn signal works fine. The right headlight does not work. Neither high or low beam. The wiring harness for the snow plow has several plugs that are identical to the headlight plugs.In a pinch, I can hot wire the right headlight to the wires for the left but I don't like to go that route if I cn avoid it. It's not neat and puts extra load on one wire system.

Anybody know where I can find a wiring schematic for the headlights on this puppy?

Sep 13, 2024 | 10:47 AM

CircuitBoardMedics

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From: Greenville, SC

If you will PM your VIN, I can pull a diagram for you.

Sep 14, 2024 | 07:12 AM

Baylinerchuck

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From: Chambersburg, PA

Quote:

Originally Posted by Ol' Grouch

I definitely would not wire both lights to one circuit. I’m not sure if all were like this, but mine was a factory kit and has an isolator. The factory harness plugs into the isolator, then the plug from the isolator plugs into the headlight. Maybe you have the same isolation box? If so, you need to bypass it to fully eliminate the isolator.

Sep 14, 2024 | 05:44 PM

Ol' Grouch

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Got the headlights working together. Circuitboardmedics sent me a diagram and I used it to trace the wires. Lo and behold, there was another headlight socket buried down in the fender bowels. It took some digging but once I got it out, the test light lit up like it should. Plugged it into the bulb and it's working fine. A polish on the lenses and I can drive at night now. I still have to track down the park and turn signals but the worst is over.