Trailer Lights Wiring

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4-Way Connector

PIN #1 - covered in plastic on trailer end - (female) -- Ground --------------- sometimes white
PIN #2 - exposed metal on trailer end ------ (male) ---- Tail Lights ---------- sometimes brown, black
PIN #3 - exposed metal on trailer end ------ (male) ---- Left Turn & Brakes --- sometimes yellow
PIN #4 - exposed metal on trailer end ------ (male) ---- Right Turn & Brakes -- sometimes green

see: https://bullyusa.com/how-to-wire-trailer-lights-wiring-instructions.html