battling ground loop

recently upgraded my whole system, im getting an alt. whine throughout my speakers only when I plug in my RCA interconnects for the sub amp. Im stuck, the amp has a great ground, wonderful power, great signals and wire connections... running everything off rcas on a pioneer 4200dvd

i am an idiot wrote: http://bcae1.com/images/rca/temporaryrcashieldrepair.html

Im not having this issue with the other 2 RCA's though. Im going to reground my amps and my headunit, also can you tell me if im not doing something right with my power. I have 1 100amp midi fuse at the battery, and in the rear I have a distribution box, with 2 100amp midi fuses going to two different amps. It seems to be drawing a lot of juice, any reason?

You have not provided any where enough information to begin to answer your questions........

If you are running multiple amps, which I an assuming you are doing, it is possible that the amps are not completely campatible with each other, ( input resistances are to far apart).

More likely, if the amps are new, you may have a bad rca, or blowen ground on just the sub out.  You could try on of those old isolation filter on the sub amp, or the suggestion above.

Ground loop issue is fixed now, it was a bad headunit ground. Now as for my power issue, my truck seems to struggle to start for some reason. I had everything powered and it was draining my battery when I came to a stop and my voltage would drop to about 10 to 11 Volts. When I started driving it would return to the normal 14.1 volts it usually reads. I disconnected one of the amps, but it continues to struggle now. Going to hook up the battery charger to it and see if it starts fine. If it does then I guess its my battery thats gone bad. Its a duralast goldtop

Just went through the same problem with my 98 Dodge Dakota.

Found out the battery was going bad.

Have your battery checked out.

My battery was bad, got a new one and all is good. Thanks man, but still when I stop I have to turn the bass down or my voltage starts to drop a ways.

Time for the Big 3. When I was younger I burned up 3 alternators from running too much power. Now that I am older I have a perfectly good fosgate 1000.1bd amp I wont use in my wife's honda crv since I know her charging system won't hold it.