High pitched whine from stereo, like alternator noise

[Syberspace]

I am hearing a high pitched whine over the speakers (at least I am pretty sure that is where it is coming from). Even when the radio is off. It is faint, but does vary with acceleration and is most noticeable around 2k RPM. I know what turbo noise sounds like, and this is not that. I have done many stereo installs in the past, it is sounds exactly like alternator whine from a poorly grounded set up.
It has been doing it for some time and is starting to bother me. I asked my wife the other day, and she can hear it as well.
No mods to the truck, except some Rigid lighting additions. No change when I turn them on or off though.
Any thoughts?
Going to have the dealer listen to it when I take it in for the exhaust rattle.
Thanks.

 

[The Car Stereo Company]

started from day 1? or did it appear over time?

 

[Hush Car Audio]

Sounds like a loose ground wire.

 

[Syberspace]

started from day 1? or did it appear over time?

I don't remember hearing it when I got it, but it has been doing it for quite a while. May be have been my excitement of the truck that I didn't notice it early on though.

 

[Syberspace]

It's the transmission... I unplugged the amp and when I had the door open, it sounded louder. It is clearly louder and coming from under the truck.
Seems this is a "normal" noise and no fix from ford. Read a bunch of threads on it... sucks.

 

[LittleLebowski]

I’ve got a high pitched static noise from the rear speakers at WOT and near there, is this the same?

 

[Hard R]

Sounds like a loose ground wire.

I bet it is a loose ground wire from the light install. This was often the problem with janky car audio installs. Don't ask me how I know.