Which Fuse and Relay Control Trailer Charging Circuit in 2017 Ford F-250

Updated 06/05/2019 | Published 06/03/2019

Question:

My camper is not charging when hooked up too the truck. Is it possible I have blown it when I accidentally reversed the polarities on the camper battery. I know stupid thing to do. I am also getting a service charging system now on the dash of my truck. It doesnt stay on long but it has done it a couple of times. I dont get this warning driving without the campwr Also will I ba able to purchase this relay at an auto parts store?

asked by: Danny

Expert Reply:

Yes, it is possible that accidentally reversing your battery connection polarity could blow the fuse or relay that protects the trailer charging circuit in your 2017 Ford F-250. The online owner's manual indicates on page 313 that the 30-amp fuse in position 27 and the relay in position 37 protect this charging circuit and these two items should be checked or replaced. I suggest obtaining both a fuse and relay at your local auto parts store; bringing in the old parts will make it easy to find correct replacements. The error code should disappear once you get the new fuse and relay installed.

Separately I will send you a link to the online manual I reviewed; please refer to page 313.

expert reply by: Adam R