Just fixed similar problem on my 2000 Ranger trailer Friday. First problem was the connections at the harness had some corrosion. Wire brushed and applied a dose of copper grease to the connections. Second problem was running light was out on right rear. Replaced and everything works.
OK, looks like I was all wrong on the grounding. I also have one running light smashed. Maybe that is it for me. I checked my ground wiring and it was good at the front of the pigtail. Maybe my circuit is broken at the running light.
Now that is a bit too personal!Originally Posted by Stein
A "smashed" light can easily short the filament circuit to ground and blow the fuse. Your issue will be on a circuit served by a Brown wire. You do NOT have a ground issue.
Check the pins in the plug, they close up. Can use a small flatblade screwdriver to open them up again. Common issue.
Check that first. If that doesn't fix it, see post #18 and rewire.
My truck is a 2012 Ford 150. I cleaned the ground wire where it was bolted to the trailer. is there another fuse box.
under the hood
If you have integrity, nothing else matters. If you don't have integrity,
nothing else matters.
Look in your owners guide. There is a fuse panel inside the cab behind RF footwell kick panel but there is another under the hood on top of the radiator. I suspect you have a blown fuse in the under hood panel. There are fuses there dedicated to the trailer tow plug. The owners guide will show which fuse to look at.
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