Based on what you're describing you need to check the wiring on the trailer, as it sounds like there's a short on the running light circuit causing the fuse to blow in the tow vehicle, which is why you keep losing that function on whichever tow vehicle you hook up.
You just need to cut out the damaged section of wiring out and replace it with some # 16-1-1 and heat shrink butt connectors # DW05744-5. Make sure the wiring is secured out of the way of any moving parts as well to prevent... view full answer...
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