'91 200 tq with Sony sound (That was a fun install)I just replaced my head unit (in a 91 200Q) with an Alpine mated to the Bose active speakers using a Crutchfield interface. I have two problems which were essentially nonexistent with the factory head unit. I have (I think) alternator whine that is not particularly intrusive at higher volumes, but is quite annoying at low volume. Working with Crutchfield's tech support and trying to make various ground connections, I have not been able to eliminate or even affect the alternator whine. I also get a loud crackling sound through the speakers when I turn the head unit off. I tried installing a relay for the speaker and antenna amplifiers (at Crutchfield's suggestion), but it made no difference, and it sounds as though there is already a relay behind the dashboard for the amplifiers.
Did (or do) you have either of these problems? If you or anyone on the list solved them or has any suggestions, I would appreciate your comments.
Thanks for your help,
Don Fujihira
88 80Q
91 200Q