Stereo system--grounding issue?

[g8rdmd]

The particulars: 2002 Turbo with aftermarket Kenwood DNX8120 stereo headunit, stock amps and speakers and subs.

I installed the unit just about one year ago and all was great. Now, out of the blue, within the last month or so, I get what I can only describe as alternator whine. It doesn't happen all the time, but often enough to be a pain. If I put the unit into standby (i.e. killing the amps), the whine disappears. If I re-engage the stereo, the whine will not always come back. Its loudness increases directly in relation to the throttle I give the motor. I'm thinking it is a grounding issue somewhere in the system. Problem is, where do I start looking, and how do I diagnose it??? And, how come it has only recently come about--did a ground wire maybe just come loose? Any guidance you guys can give would be greatly appreciated!

:renntech:

[Ross1]

You have a ground loop! Typical solution is to ground your units to the chassis. Start with the head unit since you are running the stock amp.

[g8rdmd]

You have a ground loop! Typical solution is to ground your units to the chassis. Start with the head unit since you are running the stock amp.

Thanks! I will give that a try :D

[got2]

You have a ground loop! Typical solution is to ground your units to the chassis. Start with the head unit since you are running the stock amp.

Thanks! I will give that a try :D

use a ground loop isolator between the head and amp unit: http://www.radioshack.com/product/index.js...oductId=2062214