Alternator Whine issues with complete custom Sound system!

Alright i tried everything that has been mentioned in the above comments and have come to the same conclusion that the Alternator whine is still there! any other ideas?

If it is not a power issue, then likely ground loop between head unit & amp.

Get a 1/8 stereo plug to RCA male cable and hook iPod, iPhone or Droid phone directly to amp and see if noise is gone. CAUTION, TURN VOLUME WAY DOWN ON PORTABLE DEVICE!

This isolates head unit from amp and rules out dirty power to amp.

Thanks jfoj, i actually tried that today and there is no whine! It is amongst the head unit somewhere that the whine is being picked up!

Easy way out are RCA ground loop isolators? Parts Express:com?

Sadly enough i have tried Pac ground loop isolators and they did not work!

It really boils down to a few basic issues.

1. You have a trashy output from the alternator, could be due to loose/dirty/poor connection(s) or an internal problem with the alternator diode bridge.

2. Your head unit had very poor DC input filtering and/or is connected in such a way there is a bad ground, a ground loop or in some way it is sensitive to picking up and amplifying alternator ripple.

3. Your interconnects between the head unit and the main amp have bad shielding, bad grounding or somehow is causing a ground loop.

You may need to isolate your head unit, you may need to remove it from the dash and make sure the metal chassis is not touching anything.

You could temporarily connect the head unit in the trunk at the main amp and connect it to the same power connection as the main amp. This should cure you temporarily from any noise. The slowly work the head unit back to the front of the car, possibly even powering the head until from the same connection as the primary amp.

Again, ground loops are likely the issue, however, without hearing how bad the noise is, it may be actually be a bad diode in the alternator putting out too much AC Voltage??