2002 Gmc Sierra Trailer Plug Wiring Diagram. This video will show you How to Access the Complete GMC Sierra Wiring Diagrams and details of the wiring harness. CAUTION: If you don't use the correct equipment and drive properly, you can lose control when you pull a trailer.
I hate to throw parts at it hoping to fix it, like a vent valve, purge flow valve, vapor canistor, most of which I might not know where they are located or have troble disconnecting the associated hoses or wiring plugs.
It felt as if the rear wheels were doing some of the steering - and they were.
I'd use the trailer connector harness located under the bed if you don't have a hitch, or plugged into the trailer connector if you do have a hitch. It has trailer ready wiring, i.e. it has some wires run to the rear of the pickup for lighting. CAUTION: If you don't use the correct equipment and drive properly, you can lose control when you pull a trailer.