No running lights

[BudsRam]

Hey All,
Turn signals and brake lights work. Trailer grounded from trailer harness to frame, lights grounded to trailer frame. All truck fuses are good. New 7/4 pin connector.

No running lights.

Help....?

 

[chopperman1]

Do you have voltage coming from the truck? 11 o'clock pin on truck. Ground should be carried by the 7 o'clock pin.

 

[2003F350]

I would check to make sure you've got power on the correct pin when the truck's lights are on.

Then I would hook a battery direct to the trailer plug, positive to the running light pin, negative to ground, and see if they light up.

If you don't have power to the running light pin on the truck you've got a wiring problem in the truck, could be broken wire, incorrectly wired plug, hard to say. I have also heard that some years, the charge pin doesn't get powered unless the truck is running, but I'm not 100% on that and don't know if it would affect the running lights.

If you put power to the running light pin on the trailer and they don't light up, you've got a trailer wiring problem. Not uncommon on older trailers.