So I replace my wire harness in my Frontier and all went well, It has the factory Tow package and all the relays. Hooked up the "Plug Only" to the trailer to test all. No turn signal or Brake Lights!Stupid question of the Day - Here goes...:)Do I need the hitch connected to get proper ground to make these work? That's the only thing I can think of.Thoughts Please..

No. I check my TT lights frequently, such as two days before departure, without hitching up.

You shouldn't. But, if you have a problem with the wired ground sometimes it will work thru the hitch so you don't notice the problem. Any time you have multiple things not working, or most of the time really, trailer wiring problems come down to a bad ground wire.

What is your tow vehicle?Many newer rigs have fuses for the trailer light function. Check owner's manual or the fuse panel under the hood. Note, note all vehicles have them and location may vary.Why did you have to replace the wire harness?

It was busted, got rear ended some time ago and Hitch took the brunt but snapped the plastic housing for the 7-way just enough it would just teeter when you hooked up the plug.

You could have had brakes on and it shorted or went to ground and blew a fuse.Make and model of tow vehicle?

Trailer Brake and Turn Issue | Good Sam Community

17 Replies

enblethen
Nomad
May 07, 2022
I looked up your owner's manual. It does not list fuses. It refers you to the fuse block cover.
Buckaroo_Billy
Explorer
May 07, 2022
2013 Nissan Frontier
enblethen
Nomad
May 07, 2022
You could have had brakes on and it shorted or went to ground and blew a fuse.
Make and model of tow vehicle?
Buckaroo_Billy
Explorer
May 07, 2022
It was busted, got rear ended some time ago and Hitch took the brunt but snapped the plastic housing for the 7-way just enough it would just teeter when you hooked up the plug.
enblethen
Nomad
May 07, 2022
What is your tow vehicle?
Many newer rigs have fuses for the trailer light function. Check owner's manual or the fuse panel under the hood. Note, note all vehicles have them and location may vary.
Why did you have to replace the wire harness?
KD4UPL
Explorer II
May 07, 2022
You shouldn't. But, if you have a problem with the wired ground sometimes it will work thru the hitch so you don't notice the problem. Any time you have multiple things not working, or most of the time really, trailer wiring problems come down to a bad ground wire.
Lwiddis
Explorer II
May 07, 2022
No. I check my TT lights frequently, such as two days before departure, without hitching up.

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Trailer Brake and Turn Issue

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