Ford Forum - Enthusiast Forums for Ford Owners

Ford Forum - Enthusiast Forums for Ford Owners (https://www.fordforum.com/forum/)

- Ford F-250 & Ford F-350 (https://www.fordforum.com/forum/ford-f-250-ford-f-350-15/)

- - trailer runnin lights (https://www.fordforum.com/forum/ford-f-250-ford-f-350-15/trailer-runnin-lights-13235/)

Read your post..
The difference is that the prior post was help for one lighting circuit. Since yours is multiple circuit drop out, my guess is it’s related to the trailering harnes as it extends back to the 7 way.. If you want to do some connector pinout out testing, I’ll shoot you some connector/ pin views to at least prove out everything through the relays and HL switch etc.. The trailering relays are in part through the Multi function, but the trailer park lamp is not, nor is the circuit protections tied together..

Trailer lights not working...

Quote:

Originally Posted by luvfishin (Post 36931)

My trailer running lights do not work (turn signal and brake lights do work) when trailer is connected to my2005 f350 6L. If I hook the trailer to my 2006 F 150 (same factory tow package) everything does work including the running lights. I suspect a fuse or relay but the Owners guide does not call out trailer tow running lights in either the under dash or underhood panels. What am I missing, any help??

Thanks

Here is the latest from our Ford technician which sounds like a crock to us, however, we had the same problem with our trailers. Trailer lights all in working order, plug into truck, no lights. Ford says, "Fuse (#90) is designed to fail if trailer is plugged in with vehichle and/or lights on." .... seriously? What if it's pitch black out?? Anyway, that's the "official" answer.

I know this is an old post but it helped me today. Thank you all for the info and followup posts.