I am replacing my Bose head unit in my 91 SE, and need some information about wiring. On the interface, there is common ground wires for each speaker, do I wire these into the positive wirese in the wire crimps? or do I leave these out? Is there one audio return for all 4 channels also?

 

Common ground? Sounds like that connector was hand made in the 1970's. You should be able to find all the info you need in the FAQ's.

 

do you mean where you send the + to the speakers and ground the - to the car? That was what they did in older cars for low wattage headunits.

 

Your max is definitely not going to have common ground. If your bose amps are doing good and not cracking or popping when you are turning it amp, I would just get a new h/u. But if they are, I would reccomend getting new spkrs in the process. If your amps are fine. Just head out to your local Circuit City or Best Buy and buy a bose amp interface plug. Should run you ~$50 for the harness and pick up an antenna adapter too. If you have a double din radio, might as well pick up a universal pocket too