A few months ago i bought my vectra. im wonderin if anyone can help me out with connecting the sub & amp leads to the head unit. a mate said i would need a speaker to RCA lead... which i got off another mate.

The RCA lead has 5 cables,

On its own
-Black

Joined
-Green
-Green&white

Joined
-Black
-Black&white

I need to know which each of the cables need to be connected to on the head unit cables.

Thanks T