Posts: 3508
Location: Elk River, Minnesota | Hi Everyone,
To the original poster: Do you blow a fuse on your truck? If so, I'm betting you have a trailer where the wiring is inside the trailer frame where you cannot take a look at it without removing the wiring. I would not be surprised that if you are blowing fuses on the truck with the running lights that you have a place on a wire that has worn through the insulation, and the wire is then causing a short when it contacts the trailer. Sometimes it will be fine for a while, then all of the sudden...boom...no more running lights.
If this is the case, you will be pulling wire to find the chaffing. Not a fun job by any means, but it will be the only way to fix that issue. If this is something you find you have to do, when you reinstall the new wiring, a good idea (if you can get it to fit) is to get some of the protective covering around the wiring itself, which will keep the wire from chaffing on the frame a second time.
To the running lights not working by the wheels: Chances are you have a loose connection somewhere, or a break happening on a wire. The bouncing temporarily makes the connection work, then go back off. Sometimes, this can occur with flat plug that is starting to wear out and does not stay connected easily. I have to play with my 4-flat at times where it connects with the wiring adapter (I have one of those coil type from 7 round to 5 flat) to get the running lights to stay on. If you hook up your trailer wire to the truck and turn the running lights on, go to the connecter and wiggle it back and forth....if the lights flicker, you have your issue. If not, go back and wiggle the wiring going into the actual light itself.
Steve
Edited by VMS 4/7/2014 7:14 PM
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