Q:I am having a problem troubleshooting the trailer light plug on a 2002 Chevy Silverado ... break at the connector or the wiring harness. The turn signal/brake, parking, and backup light ...

For those unfamiliar, a trailer brake ... I bought a wiring harness for a 2015–2019 Sprinter, which uses the same plug, then dug up a Mercedes wiring diagram showing the pinouts and set about ...