dont flame me here because i know this question have been asked about a million times but my brother just got a 90 se max auto, and i have a 91 5spd SE and i put all new speakers and head unit in. my brother want to put in just a head unit with the bose speakers. so they(dad&brother) got this scosche thing that is supposed to adapted to the bose system. matched all the wires and figured out what plugs are right and wired it up and it doesnt work. i have power to the headunit and antenna goes up but no sound to the speakers. yes volume is up but we cant figure out why we arent getting anything to the speakers. there isnt any hum or anything from the speakers. get back to me thanks. oh and another thing, there were 3black ground wires. we wired them all together.thanks