I hate bringing this up so often. I've done searches and I know some of you ground to the battery, some to the frame. Well, I've done both. I have two amps in the trunk, grounded to a junction block which then is grounded to the frame and/or battery (take your pick). The whine is just as bad with the ground wire connected as it is with it disconnected. So that alone should tell us something. The short wire is 0 gauge (I believe) to the frame. I then tried a 20 foot 4 gauge wire to the battery. Still no good. If it is the alternator going bad (which I doubt since it has been doing this for 2 years or more) what should I tell them to test? If they say it is putting out 14 volts (or whatever it should be) then what do I do next? I thought maybe I should just take the 4 gauge wire from the battery and touch the alternator bracket and see if that helps. Or if I have a friend in the car, should I touch anything else with the 4 gauge wire? I even ran the 4 gauge directly to the amps. Still no good. The whine increases with engine RPM.