We have exactly what you need in the 4 Pole Harness and Hardwire Kit # C59496.
Since your Honda Goldwing GL1800 has the stop light function separate from the turn lights you need this kit to combine the stop and turn signals like how your trailer is wired. To install it you will need to connect the following wires to the following functions on your Goldwing:
Green - Right Turn
Yellow - Left Turn
Brown - Running/Tail Lights
Thin Red - Stop or Brake Lights
White - Ground
The Thick Red... view full answer...
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