Tail light wiring question

[steelblueSE]

I am trying to wire in my load resistors for my new tail light LEDs. The wires coming from the part where the light bulb clicks in are a black, orange with white stripe and blue with white stripe. Which is the positive wire?

 

[BrApple]

black should be ground and the others are +12v

get a test light and turn the lights on and find out ...

 

[steelblueSE]

I ended up taking a guess on the blue one and turned out to be right.