Electrical - Running lights won;t turn off

[MilesCamp]

I'm having weird electrical problems with my truck. My wife, Cris, and I are planning to head for Central High, Oklahoma from Shelton, Washington next month (September). I'm trying to get everything ready, which usually is a quick and simple task. However, not this time. Last Friday, I took the truck to the RV shop to have the hookup checked. Everything but the running lights worked. I was told that everything worked for them. When I got it back I checked all the fuses, inside and out, and all were good. Now the problem is that I can't turn the running lights out unless I remove the #8trailer light fuse under the hood in the engine compartment. Any suggestions?

 

[tron67j]

Can you hook up another trailer and see if the problem repeats? If yes, it is an issue with the truck. If it does not repeat it is a problem with the trailer. First thing I would do is to clean all the contacts in your truck's plug with a fine file and contact cleaner. Then take the ground off and clean up all the connections points.

Good luck.

 

[bm02tj]

I could be a bad relay stuck on