| Re: got alternator whine? with system?? someone?
It's a very common problem. I answer this question many times before.
Alternator whine is most likely caused by a ground loop, which is an unwanted current somewhere in your circuit (or wiring). Mostly likely, you've grounded too many things to the same place. One or more of your devices are causing this, but it's hard to determine which one.
1. What I'd recommend is to recheck your grounds on everything you've installed, and ground them in different places. Do not have them going to the same terminal.
2.If that doesn't work, take out your entire system and wire them back again, keeping in mind of the grounding issues. When you take things apart, do it one device at a time, each time checking to see if you've rid of the alternator whine. If you disconnect a device and the whine stops, that device was the one causing the ground loop and thus, that annoying sound you hear. Just find somewhere else to ground it.
Keep in mind to disconnect the negative terminal on the battery every time you connect/disconnect something so you don't blow a fuse or ruin your system. | 
