speakers

Hello all,
I just got a 2005 Cargo astro van and owuld like to know what color wires were used for rear speakers.
GM usually uses the same wire harness for same type vechicles I figure I could find the wires and add some rear speakers like I did in my full vandura a few years ago.

Thanks,
Dave-

They are as follows;

Right Rear Negative- Light Blue
Right Rear Positive- Dark Blue
Left Rear Negative- Yellow
Left Rear Positive- Brown

I guess they are located in one ofr the harness cables running to the rear area. would they have a connecotr on the end or would they just be capped off.

Thanks for your help.

Dave-

They should have a factory connector that you will have to cut off unless you buy the wire harness adaptor.