Im stumped.

Trailer Lights all work with exception to the running lights. All lights on truck work fine. All lights on trailer work when plugged into a different truck. I have checked all fuses related to Trailer in the passenger kick panel. I have check the fuses in the engine compartment. Even the relay appears to be working (I can hear and feel it open and close when I turn the lights on/off)

Any ideas? I have not brought the volt meter out as to obviously there is no current making it to the plug. (Seeing how the trailer works on a different truck)

2008 F350 Dually. Top hat gooseneck trailer. Again, all lights, break, left, right, and hazards work. Just the running lights are not working (on the trailer only) Trucks running lights work fine.

 

bump

 

I know you said you checked, but it sounds like a blown fuse under the hood. Did you try putting in a new fuse for the hell of it? Sometimes it's hard to tell if those maxi fuses are blown.

 

Not in the ones under the hood. Ill try that I guess. I did in the one inside the kick panel. I wont have the truck until this weekend. So ill do it then

 

I know in my company's F350, that fuse blew causing what you're describing. 30A maxi fuse I believe. For only a buck or 2 for the new fuse, I'd try that first.

 

Get a test light. Test both sides of each fuse. If one side is hot but the other is not, it's blown.

 

Finally have truck back, going to start testing. Thanks.

 

Same thing happened to my dad and we even changed wiring on trailer and lights then my grandpa wiggled thefreakin connection that you plug trailer into and they came on.......talk about relief/aggravation

 

I heard thats happened to others aswell give it a good wiggle haha that sounds funny

 

Ya we hit a bump the other day and they turned on...However...Now they are off again. im hoping to get in there this week and see where the loose connection is.