Alternator Whine

[Jeff Combs]

I have had this issue pop up in several cars I have had systems in, but have always been able to figure out this issue rather quickly. This time its different , I can not come up with a conclusion to get rid of this whine I have through the interior speakers. I thought it might have been my older rca cables, so I ordered a set of SMD rca's. once installed the noise completely went away. My wife went to the store later that day and came back with the noise I though was gone. Since then I have not been able to get rid of it. I also tried installing my wife's head unit in my car that has no whine in her car, of course it whines in my car. I know its not the head unit. Any ideas on this one would be greatly appropriated.

Would a alternator going bad cause this issue. Going off the gauges, seems like its working well, as in functioning.

List of what I have, or done if it helps.

2005 Ford Escape

-SMD rca's, ran down the middle of the suv

-Pioneer AVIC-8100NEX/XNUC

-Pioneer ND-BC8 rear camera

-Rockford Fosgate T400-4

-XM sat receiver

-Sundown SCV-2000D

-Sundown 1) X12 V.2 D2

-SMD fuse block

-SMD power and ground block

-stock alt

-SMD battery indicator

-SMD fan thermostat

-Yellow top optima battery

-0 gauge power and grounds

-battery ground to chassis

-ground from engine to chassis

-power wire from alt to battery

-using the ground from the rear of car, where the amps are grounded,also tried alt locations with no sucess

-tried disconnecting anything extra, such as engine ground, alt power, xm radio, battery meter, fan thermostat,, phone charge, radar detector, nothing helps.

-installed a second head unit only to have the same issue

-grounded the rca's, makes worse

-tried a ground loop isolator, makes worse