To install the GloLight LED Trailer Tail Light - Stop, Tail, Turn - Submersible - 32 Diodes - Round - Red Lens # STL190RB you just need to match the wires by color or function.
On the light:
white is ground
red is stop and turn
black is the running/tail lights
If you have the traditional 4-way wiring, the brown is the running light, the green is the right turn and stop, the yellow is the left turn and stop, the white is ground. view full answer...