SOURCE: Trailer Brake Light Problem
try checking all the snap in connectors on the back side of the plug,
some times they get loose and/or corded.
if those are good you may have to run a wire trace. i'm not sure how much that would be, i charge 50.00 normally depending on the vehicle.
SOURCE: 1990 GMC Suburban Wiring
check for adiquate ground at trailer plug in an make sure the problems not on the trailer it self does it go away when trailer is unpluged also try ground in the taillight buckets grounds an corroded conecctor are usaly at falt
SOURCE: 2003 denali trailer wiring
If your signals & brakes are on 2 different circuits, ( for example a red lens for stop & an Amber for turn.) then you'll need to buy a converter that goes between vehicle & trailer. They're not too expensive at any trailer or RV place. I think some of the autoparts stores stock them now too.
SOURCE: wiring diagram or fuse box diagram-2007 GMC Envoy Denali
Hi there;
Here is the wiring diagram for the trailer wiring for your truck.
Hope this helps
Farrout!
SOURCE: Trailer light wiring harness
try http://www.etrailer.com/faq-wiring.aspx. They have very good concise information that might help.
Brakes - 2,
aux power - A
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