Trailer wiring....sort of

I wired the plug from my truck incorrectly and the running lights came on every time I pressed the breaks. My father in law helped me fix the plug and we had one wire left over that didn't fire when tested. It was the running lights which had a fuze blown at the time. So my question is what wire do you splice the running lights into in a four wire plug?

The same wire as your tail lights.

brown

Four way plug color codes are:

Green - right turn indicator and brake light
Yellow - left turn indicator and brake light
Brown - license, side markers and running lights
White - Ground

Five way adds:

Blue - Electric trailer brakes

Six way adds:

Red or Black - Power winch, other 12V accy.

Seven way adds:

Purple - Back up lights


Hope this helps. One thing I recommend is to run a white wire to each light instead of doing what most trailer folks do and use the frame as a ground.

Fishtaco is right....running that ground wire to everything is a good idea.