[Skrugs]

All lights on truck work.
Trailer running/park lights not working, FUSES ARE GOOD!!!!!
Whats is working at 7 pin, L turn, R turn, stop, Aux. power, back up lites, and brakes.

The fuse that controls the running/park lights also does the trailer back up lights. Trailer back up lights work.

Please help.

Thanks

 

[AK1]

Mine ended up being a poor ground on truck's end, tapped into it near spare tire and grounded to frame.

 

[Centxdiesel]

Check connector and current and ground, then check each of the offending bulbs and sockets. make sure somebody did not put bulbs in incorrectly. Also AK1 has a good point about ground so when checking each bulb you are checking ground. On mine I run a ground wire so I dont have to deal with grounding through the hitch like a lot of people do.

 

[JLDickmon]

there are also relays for the trailer wiring under the hood.. might want to check them..

trailer wiring p!$$es me off so bad...

 

[salprofish]

prob a ground issue of some kind

 

[Skrugs]

Owener's manual doesn't show a relay for running/park lights.

 

[Skrugs]

Hooked up second ground, still no power at 7 pin for running lights.

 

[tgf]

check the plug on your truck, mine did that a few weeks ago, had a poor connection. if that doesn't work you'll prly have to start tracing wires to make sure something didn't get into them

 

[JMF350]

The relay for trailer park lamps on my 99 is under the dash, between the radio and steering column, low..... PTA to get to. If you have installed the trailer tow package/brake controller harness.... where it plugs into the truck harness under the dash, it's in the same 3-4" space.

 

[Skrugs]

Took the dash apart this morning. Relay fell out. Put it back in place and lights are working. No clue how it came out.

Thank you all for your help.

 

[JimTJr]

You have separate fuses for trailer lights, in case you didn't know. You can have all lights working on the truck, and no signal/brake/running lights on trailer....

Ah, just read your last post, glad you got it fixed!