Diagram Of 4 Prong Wiring Of Trailer. Maybe you can follow the cable and see if you can find a breakout that leads to a ground. I picked up a trailer that has typical brake/signal lights but it also has amber turn signals on it directly below the brake lights.
Our trailer wiring diagram is a colour coded guide designed to help you wire your trailer plug or socket.
The trailer with a four wire plug only uses the white wire for ground, the brown wire for the running lights, the yellow wire for the left signal and brake and You need to install a four prong plug of the same configuration and wire it exactly as the original.
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That fourth prong is a ground wire and is there for better electrical safety. What to do if your cord does not match the plug. There was no dedicated ground slot on the receptacle (outlet), and dryer cords had no ground wire or ground prong.