Hello,
I am having an issue where when the brake is applied, the backup lights come on as well.
When the emergency flashers are on, the backup lights come on as well.
When the left blinker is turned on, it works with no issue.
When the right blinker is turned on, the backup lights come on as well.


This is what I have done....
Removed each light assembly and independently checked to rule out a defective circuit board. (though I'm not convinced of this just yet)
Check all ground wires to the best of my ability. All seem in good shape. The tail light wiring in general seems in good shape.
Checked, with voltmeter, wiring feed from front of car at connector and that works as it should. When I connect the tail light harness to the feed connector, voltmeter shows 12V on backup light wire at tail light harness connector. Which kind of makes sense.
I'm really at a loss here. Everything points to a bad ground, but I'm just not seeing it.
Is there a way to simply run a new ground wire, or is that a major undertaking?
Thank you. Any help would be appreciated....

 

Check your trailer socket for corrosion or shorted wires. Someone else had weird electrical issues (like yours) that was caused by corrosion in the trailer socket.

 

Thanks anyway a55bruce.
This problem was solved days ago.
I submitted this Thread on 09/04/2015. I've never seen a forum that takes 5 days to post.

 

I thought it was strange that it just today showed up on my UN-read listing.
What did you find to fix the problem.

 

What did you do to solve this problem I would really appreciate your help my sister's 07 Tahoe is doing the same thing I was going to run a new ground wire by removing taillights and splicing into where the 2 black wires are joined into 1 ground wire as seen in a YouTube video . If I don't get a response I'll post later if this solved my problem