2001 gmc denali bose system

Are you planning on using the bose speakers with an aftermarket amplifier?  Or did you just want to use the existing speaker wiring?

just so you know, you can't use the bose speakers with aftermarket amplifiers because they're 1 or 2 ohms and most amplifiers can only handle 4 ohm speakers.

the bose speakers are probably 1 ohm, which means the only way to hook up to an aftermarket 4-channel amp would be to hook up two bose speakers in series, and then run the single load off one amplifier channel (2-ohm stereo load).  I'm sure there aren't 10 full range speakers in the vehicle, so you can probably get away with hooked up some of the tweeters in parallel.

The easiest way to figure out which wire goes to which speaker, would be to use a speaker popper.  Basically just a 1.5v or 9v battery with a wire hooked up to the positive and to the negative terminals.  Then you put the positive on one of the speaker's leads, and the negative on the speaker's other lead, and you'll hear one of the speakers make a popping noise.  Then for polarity use a multimeter to measure voltage across the two speaker leads on the amplifier side, while the radio is turned on.  Positive voltage means the wire touching the red test lead is the positive speaker wire, and negative voltage means the wire touching the black test lead is the positive speaker wire.

Just make sure you do the speaker popping on the side of theharness that is coming OUT from the amp, so that you don't send voltage into the amplifier cuz that could damage it.

And remember, if you don't get creative with the speaker wiring and instead just hook it all up to aftermarket components as if the bose speakers were normal speakers, you will more than likely fry your aftermarket amplifiers.