SOURCE: no power to trailer running lights
Hi,
This is a known issue and to my knowledge there was even a recall order to correct this fault. It would seem the the wiring harness itself is the reason. You may want to reference these pages here and/or here.
Should you however prefer to perform a DIY, then you would need a DVM to check for voltages. This page shows the possible wiring scheme used by most manufacturers for trailer configuration.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
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: 2006 GMC Sierra 2500HD 4WD trailer light connection fuse blown?
under the hood on drivers side right behind the battery. Will be marked trailer light left sand right.
SOURCE: Trailer light wiring harness
try http://www.etrailer.com/faq-wiring.aspx. They have very good concise information that might help.
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