Changing Trailer Single-Wire Running Lights to Stop/Tail/Turn Lights  

Question:

Expert Reply:

You need to replace the light with one that is a 3-function for stop, tail, and turn functions. The light needs another wire to connect to the stop and turn signal functions like part # ST31RB has. Since yours only has one wire it grounds through the mounting hardware. The turn and brake lights are on one circuit so you just need a light with one more wire to add that circuit.

expert reply by: Charles S

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