From this boating site.......
"TRAILER LIGHTING WIRE COLOR CODE AND LIGHTS
Did you ever wonder what wire went where on your trailer light system? check the chart below:
The following wire color code function is used:
A. White wire - is your ground.
B. Yellow and brown wires - travel on the left side of your trailer.
C. Green and brown wires - travel on the right side of your trailer.
D. Yellow wire - is for your left stop and turn signal lights.
E. Brown wire - is for tail lights, clearance and marker lights.
F. Green wire - is for your right stop and turn signal lights."
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