7 Pin Trailer Light Wiring Diagram. If you have a round connector, commiserations. Seven-pin connectors are rarely used on trailers for local use.
Any recommendations on where to get one?
Check your trailer-wiring connector where it plugs into the truck, and all other exposed wiring on the trailer itself.
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If you have a round connector, commiserations. I'll included a diagram at the end and add if you want to install clearance lights too. The following trailer wiring diagram(s) and explanations are a cross between an electrical schematic and wiring on a trailer.