Installing some new rear blinkers, having some trouble figuring out witch wire is positive or negative on the stock wires coming from the bike. One wire is cased in a solid grey the other is striped. Someone shoot me straight here?

 

Black with yellow is ground for most of the bike, the other wire will be the positive.

 

Here ya go.

 

I just replaced my rear blinkers earlier this week. On both sides the black wire is the negative. I think on one side the positive is grey and on the other its green or yellow. Dunno what happened to just straight red and black wires, guess that was too simple.