Parking lights are not working on my truck. Brake and Turn still do. This is because the bulbs have two filaments and dim one and bright one.

Does anyone have a wiring diagram, or a diagram for the rear harness so i can identify which wire.

I have checked my headlight switch and it is putting power out on the correct wire. I must have a brake / short somewhere. So I am just going to run new wire from the switch to the back of the truck.

 

most the time it is brown and white. look at the wires going to the license plate light. black ground, the other is you running lights

 

Do the front parking lights work?

 

I have to check. I'm not sure if the license plate lights are on the same wire.

@recgod13, the front parking lights are separate from the rear circuit wise. Different spots on the headlight switch. Switch is fine tested out good with the ford shop manual tests.