Park lamps, running lamps and side marker lamps not working

IRISHMIKE41

MEMBER
2010 FORD F-150
5.4L
V8
4WD
AUTOMATIC
124,000 MILES

I noticed I have no park lamps, side marker lamps and no running lamps, but brake lights, head lights and turn signals all work. Fuse 22 blows immediately and replacing every time. I'm not sure where to start, I installed a raptor grille with lights built in and T tapped into passenger side marker lamps circuits, and I removed the T taps and retested with a new fuse to see if the grille lights were the cause and the fuse still popped when I tried to turn the lights on. Any ideas?

Saturday, September 11th, 2021 AT 11:30 AM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

If it fails immediately before anything is turned on, I need you to pull the parking light relay and see if it still fails. If it does, then the problem is likely in the relay box

I attached the entire wiring schematic below for the lighting system. There are two pages of wiring schematics, but I had to cut them in half to make them readable for you. I did overlap them so you can follow from one to the next.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

I'm not sure exactly what was installed. However, if this wasn't a problem before, there has to be a wire pinched or shorted. Recheck everything that was changed.

Let me know what you find.

Joe

See pics below.

Images (Click to make bigger)