Quote:
Originally Posted by Roger Kimble
Do you have a four prong plug or a seven, with a seven prong you can run a wire and charge the battery as you go down the road
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The common 4-pin flat trailer connection is the bare minimum to be able to tow a trailer with exterior
lights. The 4 pins are:
- White = ground or return
- Brown = running/clearance lights
- Yellow = Left turn/Left Brake light
- Green = Right Turn/Right Brake light
Then trailers got big enough to need their own
brakes. Some boat trailers have just a 5-pin flat connection. The 5th pin is a Blue wire to activate the trailer's electric brake shoes. Next in line is the "Battery Charge" wire; it's the 6th pin and has a Black wire, 10 or 12 gauge which is heavier than the others. Those are most often 14 gauge. Some early connectors were 6-pin round. Then they came out with the BIG black 7-pin round connector, adding an "Auxiliary" circuit on the 7th pin. Many newer trailers use this line for back-up
lights on the trailer. "They" reconfigured the color code for this connector which causes confusion at times.
Since Yellow is now the 7th pin for the back-up
lights, the code changes for the 1st 4 pins to:
- White = Ground/Return
- Green = running/clearance lights
- Red = Left Turn/Left Brake light
- Brown = Right Turn/Right Brake light
- Blue = Brakes
- Black = Battery Charge
- Yellow = Back-up lights
Confused?