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Here is a diagram for the basic 4 wire trailer. Yellow - Left Stop/Turn (the big filament as you described in the left bulb) Green - Right Stop/Turn (the big filament as you described in the right bulb) Brown - Parking/Marker lights (the small filament as you described in both the right and left side bulbs) White - Ground They all hook to the ...

I haven't used one of these, so I can't speak from personal experience, but this connector looks promising. I found a review of the connector, I have no idea how independent it is, but it goes into the build details.