Undertail lights
 

Just bought undertail kit, not sure what wires do what. Tail light and blinkers are the same light. Lights came with these wires Red, Black, Blue, Yellow. Please help.

RE: Undertail lights
 

it didnt come with instructions?

RE: Undertail lights
 

try this:

red: positive taillight (+)
black: negative taillight (-)
blue/yellow:positive blinker

Try blue and yellow to see wich color is left and right.

Blinkers use black wire for ground, so the green wires (negative blinker) are no longer used.

RE: Undertail lights
 

if its like the stock colors then...blue is right and yellow(or orange on an f4i) is the left side.

take a picture of the wiring in the inside if you want that may help.

RE: Undertail lights
 

Thanks i got the lights working, sorry didn't get back sooner, had knee surgery.