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Running lights quit working so I did a fuse check and it was blown, changed it out and seemed to fix it. Got up this morning, turned lights on (worked) and as soon as I put the brakes on, the running lights went off (blown fuse, again). Signals and brake lights on trailer work but the running lights don't...what would you say this is...a ground problem? All truck lights work as normal.
I would run down the trailer light wires and make sure nothing is rubbing against the trailer causing it to blow the fuse.
I had the same problem. I had to pull the wires and found a rubbed spot that had no insulation. It was touching the trailer and blowing the fuse. The trailer is now rewired with the wires inside plastic tubing and no problems since.
I had the same problem and mine was in my tow vehicle. The running lights wire Brown in Color had come out of the factory plastic cover and laid against the frame of the truck and rubber a small hole in the insulations. Take about taking a long time to find. Man it was a bitch. http://www.bassboatcentral.com/smileys/doh.gif http://www.bassboatcentral.com/smileys/doh.gif