Every standard is there for a reason, so don't go wiring your trailer without the proper guidance. Each of these trailer 4-pin connectors comes with unique wiring diagrams. It can be a real pain ...

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 ...