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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 35599
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I have Ford F-550 XLT ,2014 The Running light and the

Customer Question

I have Ford F-550 XLT ,2014
The Running light and the trailer light not working , I already checked the fuzes it is fin
Submitted: 9 months ago.
Category: Ford
Expert:  Ron replied 9 months ago.

Hello. My name is ***** ***** I am happy to assist you today. Give me just a moment to review your post, and I'll be right back with the help you need.

Expert:  Ron replied 9 months ago.

Are the running lights out on the truck as well as the trailer?

Customer: replied 9 months ago.
The tuning light for truck and trailers not working
also the trailer signal not working and the brake light for the trailer only
The truck signals and brake are working !
Customer: replied 9 months ago.
The running light on truck and trailer not working
Expert:  Ron replied 9 months ago.

There are 4 fuses that can effect the running lamps, which fuse did you check?

Customer: replied 9 months ago.
Passenger compartment fuse panel
No12,13,14,15 (15A) all look good
Expert:  Ron replied 9 months ago.

The correct fuse for the running light circuit on the truck are the F22, F24, F 30 and F 40 all located in the interior fuse panel (BCM). Let go back in and recheck these to be sure you have power in and out of all 4 . Let me know what you find and we can work from there. These fuse need to work so the trailer will work as well.

Customer: replied 9 months ago.
I checked the fuzes
F22 has power in and out
F24,F30,F40 No power in and out
Expert:  Ron replied 9 months ago.

Power to these fuses come from the park lamp relay which is Incorporated into the BCM (interior fuse panel and if the relay has failed then that means you will need to replace the BCM. See the wiring diagram in the link below for reference.

Customer: replied 9 months ago.
Than mean we have to replace the hole passenger compartment fuse panel
Expert:  Ron replied 9 months ago.

If you not getting power out of the relay to the fuses then unfortunately that is correct. If in fact the BCM has failed programming needs to be done when replacing it,