Trailer tail light staying on

Question

I had to replace the 7pin connector on my trailer that connects to the tow vehicle.  Everything works fine when connected to the tow vehicle (2014 F-150) but when I disconnect the trailer and go on battery power the right tail light on the trailer stays on. Any suggestions for troubleshooting this other than redoing the plug?

rjsfishin · Answer

If it didn't do it before, I would have to suspect the hot 12v charging wireshort circuiting to the taillite wire.

wnjj · Answer

Take the plug apart.  You likely have a couple strands of wire shorting between the right brake light and the +12V pin which are next to each other.  Plugging into the truck may cause the pins to move enough so the strands no longer touch inside the plug.

mandalay_parr · Answer

A good rule of troubleshooting is to go back to last place you were. And, that was the plug.

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Trailer tail light staying on

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