Lighting issue
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Junior User
Joined: Mar 2011
Posts: 59
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From: 29 Palms
Lighting issue
Problem: all lights behind the cab are dead.
Symptom: Dead brake/tail/turn, reverse, license plate, and side marker lights. Trailer wiring still lights up trailer lights. There is one slightly frayed ground running to the 9 pin connector for the slide in camper, trailer's 4 pin plug ties into the same ground.
Truck: 73 F-250 Camper Special Ranger XLT 2wd w/390 and C6
Symptom: Dead brake/tail/turn, reverse, license plate, and side marker lights. Trailer wiring still lights up trailer lights. There is one slightly frayed ground running to the 9 pin connector for the slide in camper, trailer's 4 pin plug ties into the same ground.
Truck: 73 F-250 Camper Special Ranger XLT 2wd w/390 and C6
Senior User
Joined: Jan 2006
Posts: 128
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From: St. Peter, MN
that's funny because I just came in from the garage having the same problem. Mine all work for about 2 seconds then the back end lights go out though. I push the light switch in and pull it out again. same thing. 2 seconds on then off until I work the switch again. Maybe someone has an answer that will solve both issues. I'm thinking a bad ground or something.
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Junior User
Joined: Mar 2011
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From: 29 Palms
Lighting has been fixed. Wiring was bad. However, I have a new problem:
When I turn off my headlights, the only way to get the running lights and dash lights to turn off is to disconnect the negative on the battery for a second and put it back on. I've been told of a possible relay sticking, any advice? I just replaced the headlight switch and nothing changed.
When I turn off my headlights, the only way to get the running lights and dash lights to turn off is to disconnect the negative on the battery for a second and put it back on. I've been told of a possible relay sticking, any advice? I just replaced the headlight switch and nothing changed.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Lighting has been fixed. Wiring was bad. However, I have a new problem:
When I turn off my headlights, the only way to get the running lights and dash lights to turn off is to disconnect the negative on the battery for a second and put it back on. I've been told of a possible relay sticking, any advice? I just replaced the headlight switch and nothing changed.
When I turn off my headlights, the only way to get the running lights and dash lights to turn off is to disconnect the negative on the battery for a second and put it back on. I've been told of a possible relay sticking, any advice? I just replaced the headlight switch and nothing changed.
Click on the .pdf link to see the relay location.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
No, that's just a plug. It's one of two plugs (the other one's red) that connects the frame wiring harness to the main harness. The relays I was talking about are the three in the lower right of the illustration with the basic P/N of 14677. Your truck may or may not have them.
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Junior User
Joined: Mar 2011
Posts: 59
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From: 29 Palms
Looking under the hood, I don't see a row of relays in that area. However, I had a thought: if the plug I pulled connects the frame harness to the main, does the trailer harness tie into the main? One of the trailer wires is hanging loose. If that were ground, would that cause the lights to stay on? Pulling the battery ground shuts em off. As it sits right now, that plug is undone so could it be taking the trailer wiring out of the loop, thereby allowing the lights to operate as they're supposed to?
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