ground noise is driving me insane

I have a 1996 camaro with the bose sound system.  i have replaced the bose head unit with a clarion head unit and also have added a audio control 3.1 and a sub.  the ground for the sub is not a problem.  the noise comes from the original bose system, I have tried grounding the head unit and 3.1 to the neg. terminal of the battery and also have tried to adjust the ground loop isolators within the 3.1 all of which still leaves me with that annoying whine.  aside from that it sounds great though.  any help will be appreciated greatly (to prevent me from going insane).

Do not ground to the battery. Your ground will have to high of resistance. You need to find a piece of metal within about 3 feet of the deck and ground your units there for a good ground. A battery is a floating ground and is actually fairly usless for stereo sakes.

Yea just scrape some metal around your headunit location and ground it with a self tapping screw and a star washer.~The Rookie~

Rookie of the year that is...

Don't let the smoke out of your equiptment..it doesn't go back in.

Actually that is incorrect, measure the resistance at the the factory grounding point and it may be high, if it is above .5 ohm run it to a new spot where the resistance is below .5 ohm and if it cannot be made to get below .5 ohm, then ground to the battery. Usually the factory ground wire shares a circuit with something else that may be generating noise. A battery is a necessary evil for stereo sakes, for electricity is an algebra equation, what you do to one side you must do to the other. A good and proper ground is essential in any electronic device.Top Secret, I can tell you but then my wife will kill me.

You replaced the Bose HU but kept the OEM Bose speakers and amps?  That's your problem.  You have an impedence mis-match between the HU pre-outs and the factory Bose amps... or wirse yet, you are running speaker level outs to the Bose amps.  I suggest removing the OEM Bose amps (and replacing the speakers too) and running an all after-market system.