trailer lighting problem

[mo powerstroker]

For some reason my 09 randomly blows the big fuse under the hood that operates trailer running lights. brake lights and brakes, turn signals still work just no running lights. If I change it i might be able to go 60 miles with them working then at some point i look back and have a dark trailer. I know it is not the trailers because i pull them with my 03 often and it never blows the fuse works fine. This truck is under warranty but i have a dpf/cat delete and really don't want to take it in for this problem and them see that and cancel engine warranty if i have future problems

[dhanna6powerstroke]

Originally Posted by mo powerstroker

For some reason my 09 randomly blows the big fuse under the hood that operates trailer running lights. brake lights and brakes, turn signals still work just no running lights. If I change it i might be able to go 60 miles with them working then at some point i look back and have a dark trailer. I know it is not the trailers because i pull them with my 03 often and it never blows the fuse works fine. This truck is under warranty but i have a dpf/cat delete and really don't want to take it in for this problem and them see that and cancel engine warranty if i have future problems

Sounds to me like a bad ground connection or chafed wire rubbing somewhere.

[mo powerstroker]

Ya could be It has been doing it since it was new but i didn't tow much with it the first 8 to 10k or not at night anyways so by the time i realized the problem i had done the dpf/cat delete and intake and really don't want to take it to dealer with dpf off.

[dhanna6powerstroke]

Originally Posted by mo powerstroker

Ya could be It has been doing it since it was new but i didn't tow much with it the first 8 to 10k or not at night anyways so by the time i realized the problem i had done the dpf/cat delete and intake and really don't want to take it to dealer with dpf off.

Did you keep the stock DPF? If not, I would go talk to the dealer and kinda feel them out about what they think about deleting the DPF and see if they are "mod" friendly.

[mo powerstroker]

yea i have the dpf just really don't want to put it back on if don't have to. Your write i should go to the dealer and see if i can figure out if they would freak if i brought the truck in with dpf off or not. They are a huge dealer so that concerns me. They probably would like to find a reason to not work on my truck

[dhanna6powerstroke]

Originally Posted by mo powerstroker

yea i have the dpf just really don't want to put it back on if don't have to. Your write i should go to the dealer and see if i can figure out if they would freak if i brought the truck in with dpf off or not. They are a huge dealer so that concerns me. They probably would like to find a reason to not work on my truck

Yeah, I would do that and if they act kinda funny I'd just put it back on. No point in paying to have a wiring problem fixed while under warranty. My experience with wiring is it's either really quick and easy to fix or it takes forever and most places charge by the hour to fix wiring/electrical issues.

[kevinah]

I had this happen with one of my trailers. It was right after I got the truck, i assumed it was the truck since it didn't happen before. I didn't have a light issue on any one of the trailers prior. Then, I get a new truck and tow 2 different trailers with it. I blew the big fuze you speak of. After going through absolutely every possibility. Tracing wires, replacing the fuze, taking the truck to Ford, etc. I found the male end plug "on the trailer" very dirty, corroded and needing replaced. I replaced the plug and haven't had a problem since.

[kevinah]

OH, also, I did have brake lights and also signals. It was just driving lights all the way around just like you are talking about. Could just be the trailer. Save your knuckles by checking the trailer first.

[mo powerstroker]

Well maybe i should check the trailer plugs first they seem to work fine on my 03 though but maybe the 09 truck is more sensitive to a dirty plug or something thanks

[MCADB]

Im having the same problem. Just the running lights. I had added a set of the 3 red running lights under the tailgate a year ago and everything was fine until 3 months ago when I tried to pull a trailer. I blew the fuse under the hood. I figured maybe my install of those running lights was no good so I redid them. A week later I got a notification on the dash that the trailer wiring had a fault....so I hit reset. The lights still work. I dont know. Sounds like a problem.