Posts: 2754
Location: Mauston, Wisconsin | How is the boat trailer wired, 4- wire or 7 wire? Is the vehicle wiring hooked up according to the 7-Way plug manufacturer's instructions for your vehicle, i.e., like shown in the 7-wire diagram here->
http://www.accessconnect.com/trailer_wiring_diagram.htm
Flat 4 wiring code
white -> ground
yellow -> left turn/brake light
green -> right turn/brake light
brown -> tail light
Wiring Code 7 way Trailer End #
Color - Circuit Function
1 white - common ground
2 blue - electric brake
3 green - tail/running lights
4 black - battery charge (+)
5 red - Left turn/stop
6 brown - Right turn/stop
7 yellow - auxiliary/back up
I see three choices if the trailer is 4-wire:
1. Rewire the trailer to 7-wire system. This probably will require new tail light assemblies, wiring harness, etc
2. Put the 4-wire plug back on the trailer and get a 7-wire to 4-wire adapter. The adapter has the necessary connections with blocking diodes so that the brake lights will work properly.
3. Hook the trailer 7-way plug up with the following color connections to the 4-wire trailer harness >
Vehicle 7-Wire to Trailer 4-Wire
White -> White
Green -> Brown
Red -> Yellow
Brown -> Green
Tape off all other wires on the 7-way trailer pig tail.
Good luck!
Al
Edited by ESOX Maniac 8/24/2008 12:12 PM
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