Location. Buffalo, NY. May 22, 2004. #3. quikki said: I was wondering if any one had a diagram of the 7 pin receiver on truck. This is the plug on the truck’s wiring harness that plugs into the back of the trailer socket under the bumper. . While this is out of the 2002 shop manual, these plugs should be standardized, and both the wire colors …

https://www.chevyavalanchefanclub.com/cafcna/index.php?threads/diagram-for-7-pin.27500/