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Old 09-20-2020, 08:09 PM
Vux73 Vux73 is offline
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Weird trailer light issue

Ok weird issue going on with my trailer lights.

No lights work at all on my trailer except if I turn my lights on my truck then everything works except my blinkers and they work when I mash my brakes. Confused yet? Yeah me too.

Not sure what’s going on. Seems like a short of some kind.

Thoughts?
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Old 09-20-2020, 08:18 PM
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waterlogged882 waterlogged882 is offline
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Quote:
Originally Posted by Vux73 View Post
.....Thoughts?
Grounding is the first thing to come to mind.

Is the trailer light connection wired to ground to the truck or are you assuming the trailer tongue to ball is sufficient ground?

$0.02

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Old 09-20-2020, 08:49 PM
mikeg205 mikeg205 is offline
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^^^^ this

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Old 09-20-2020, 09:14 PM
KMS KMS is offline
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Bad ground.

99% of the time, if it doesn’t make sense...it’s a bad ground.
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Old 09-20-2020, 09:36 PM
Vux73 Vux73 is offline
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10-4, I’ll check the ground. Thanks!
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Old 09-20-2020, 11:00 PM
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Fullpass Fullpass is offline
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If the lights worked correctly before then I would also say ground, on the truck side make sure ground is to the frame, you get all kinds of crazy things going on…with a missing ground connection.
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Old 09-21-2020, 09:35 AM
jgraham37128 jgraham37128 is offline
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Grounding issue.
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Old 10-03-2020, 08:12 PM
Vux73 Vux73 is offline
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Forgot to give an update. I found the ground wire and unscrewed it from my trailer. Was some corrosion on it so I wire brushed it and reinstalled. Lights working normal again.
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Old 10-07-2020, 11:24 AM
4Cs 4Cs is offline
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I had the same issue earlier this summer. Thought is was a grounding issue on the trailer, but turned out to be a fuse on my truck. I have a 2011 F-150. There's a separate fuse for each the running lights and turn signal/brake lights. The running lights worked but the brake/turn lights didn't. I had borrowed a small utility trailer earlier in the year that supposedly didn't have working lights, but what was really happening was that trailer had a short in the brake/turn lights that must have blown my fuse as soon as I hooked it up. Of course, I only checked the truck fuses after spending hours on the trailer wiring...but that's how things roll in my world.
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