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 Trailer lights 
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Post Trailer lights
With test light truck lights work, with battery lights work on trailer hook up trailer to truck and lights don't work wtf???

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Thu Jul 06, 2017 7:15 pm
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Post Re: Trailer lights
Ground?

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Thu Jul 06, 2017 7:28 pm
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Post Re: Trailer lights
That's what I thought it was. I hooked a jumper from a battery to the trailer plug and all the lights work. I also checked the truck with a test light. When I plug the trailer into the truck none of the trailer lights work. I also cleaned all the ground connections on the lights on the trailer and used electric grease. Any ideas?

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Thu Jul 06, 2017 7:47 pm
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Post Re: Trailer lights
To test, run a seperate ground from the trailer to the truck.

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Thu Jul 06, 2017 7:54 pm
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Post Re: Trailer lights
I would bet the ground wire on the truck isn't connected. Hook your trailer up to your truck and use a jumper wire to connect to a good ground on the truck and a good ground on the trailer. I bet they will work then.


Thu Jul 06, 2017 7:57 pm
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Post Re: Trailer lights
Russ beat me to it.


Thu Jul 06, 2017 7:57 pm
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Thu Jul 06, 2017 7:57 pm
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Post Re: Trailer lights
Truck chassis to trailer


Thu Jul 06, 2017 7:59 pm
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Thu Jul 06, 2017 8:17 pm
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Post Re: Trailer lights
Are you 100% sure the truck is wired correctly, does the truck have amber rear turn signals?

If so, is the harness converter working properly? Factory wiring on the truck? What yr truck?

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Thu Jul 06, 2017 9:07 pm
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Post Re: Trailer lights
I had a similar problem, all lights on truck worked but trailer lights would not! When I started I checked the truck and it was working, but for some reason the first time I pluged in the trailer it blew 2 fuses on truck(2007 F150) and the truck lights still worked because they were on a separate fuse. They do make a plug that is a circuit tester for the 4 pin that all it has is indicator lights that show if all "circuits" are working at the plug on truck.

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Fri Jul 07, 2017 8:04 am
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Post Re: Trailer lights


Fri Jul 07, 2017 9:24 am
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Post Re: Trailer lights
http://www.academy.com/webapp/wcs/store ... wAodSgQCFQ

This.


Fri Jul 07, 2017 9:36 am
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Post Re: Trailer lights
If the test light is working in all ports (turn/stop, and park) you can trace it down from there.

Bad plug on trailer side
Cut in the wiring somewhere
Bad ground (you say you eliminated this)
Corrosion at light connections
Bad grounding at lights. (Most use the trailer frame and not direct wiring)

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Fri Jul 07, 2017 9:42 am
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Fri Jul 07, 2017 9:44 am
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Post Re: Trailer lights

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Fri Jul 07, 2017 10:21 am
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Post Re: Trailer lights


Fri Jul 07, 2017 11:23 am
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Post Re: Trailer lights
It's aftermarket, mine is a Curt brand. Uhaul may have one

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Fri Jul 07, 2017 4:11 pm
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