Hey man i have a bmw 1990 525i. Ill give you a tip. never cut your wires i did
lol first things first i dont like this hole posting thing however i love instant message lol do you have a *IM* like msn,yahoo, google? anything if you do post it here ill check it later on today. it's 6 in the morning where i live add me on gmail or yahoo or msn all three of them are email@example.com
or my yahoo is firstname.lastname@example.org
Now about the wires i think your car is perty close to mine and ill give you pictures of how i hooked it up. and im 99.9% sure i know what your problem is. i had the same one. your amp isent turning on and your speakers dont get power. but your deck turns on correct? if it does turn on then it's your amp. i had info on my bmw 1990 525i e34 i also had info on your car. And lol they both are usless for my car. meaby you can use them but i wont post anything untill you contact me. cuz i figure it's pointless for someone to post something and people read it and get noware.