Each of these trailer 4-pin connectors comes with unique wiring diagrams. ... CURT CURT 58030 Trailer-Side 4-Pin Flat Wiring Harness with 12-Inch Wires. $2 at Amazon.

Corner Wrench: The scoop on trailer wiring. Whether it's a four- or seven-pin connector, wiring hitches into modern vehicles is more complex than ever ...

Q:I am having a problem troubleshooting the trailer light plug on a 2002 Chevy Silverado. I get no power there. I've checked all the fuses and they're good. I expect it's a simple grounding ...