alternator whine

Ok let me try and get this straight. It only happens when you turn the volume up to half and above, but then keeps happening after you turn the volume back down, or does it only happen at half and above period? Does this sound change when you rev the engine? A ground loop problem will change pitch when the engine is quickly reved, then drop back down to a constant level when car is idling.

audioman2007 wrote: Ok let me try and get this straight. It only happens when you turn the volume up to half and above, but then keeps happening after you turn the volume back down, or does it only happen at half and above period? Does this sound change when you rev the engine? A ground loop problem will change pitch when the engine is quickly reved, then drop back down to a constant level when car is idling.

Exactly on the first, its not there when the car is first started, or at low volume, once mid and above volume happens, the noise becomes evident, even if you turn it down, or muted for a time period of less than 30 minutes. Within that time period,at least 30 min or less it goes away. Again, to me, it seems like its only happening once the charging system/battery is under a heavier load, such as the draw from both amps. I spoke with the owner, and he said he noticed it in a few diff instances. The first being that he said the alt was squealing rather bad, and when that would happen, it would start. Once the car hit a significant bump, due to the harsh ride of an air ride equipped vehicle. Also after driving for a period of 45 min or more, turning the vehicle off for a short period of time, then again upon restart. When I spoke with him, I told him the issue I was having with trying to track the noise to the source of the prob vs not knowing the time period of which the noise dissipates on its own. I have never heard of any prob like this even remotely similar, that of which its not whining all the time, only select moments, etc which again puts me back to square 1 of thinking that the heavier current load is torturing an already old and tired alt, which is giving an adverse effect. I'm going to keep trying on this 1, its 1 of those problems that needs to be found, just for future ref if it happens to anyone else