What color wire is what on 05' Silv.

[ironnut]

I have sirius startmate and have the FM direct adapter which is supposed to give you better sound and it allows you to not the tuner pluged into the cigar lighter. I got my deck hanging out and need to know which color is + and which is -. I think the black w/ whit stripe is neg. It's an 05' silverade with a standard CD player deck.
Thanks