I found a connector that comes off of the rear harness but i am unsure what it is for.
Chevy third brake light wire for topper.
I install toppers truck accessories crap all day.
Hi all i am trying to wire up my 3rd brake light on my are topper cap and i cannot seem to find the light blue wire that people are talking about tapping into for the brake only signal.
If you cant find that just ask.
We do not wire the 3rd brake light like this here at a better truck cap hitch.
Its what i do for a living.
The truck has a signal control box or whatever mounted above the spare i assume theres a simple plug and harness that can tap into that controller and then the rest is easy.
Hey i found the problem.
Tapping into your trailer wiring or a tail light definitely isnt the right way to wire a 3rd brake light wire.
Apr 06 2017 6 07pm.
I need to wire the center overhead brake light on the topper topper already has the light and it is wired.
Another company wired the 3rd brakelight on this cap.
Wiring truck cap 3rd brake light.
Me and my circuit tester decided that the installer connected it to the right connector just the wrong color wire.
Wiring truck cap 3rd brake light.
Chevy truck forum silverado sierra gmc truck forums.