A/C, Radio 7 Fuel Pump Problem - Bad Ground?

Last week, my speakers would output a whining noise directly correlated to the gas pedal while driving but
everything else worked perfectly.

I brought the car in to get rear tires replaced and a front alignment. I left and the noise was gone.. However,
now my AC blower blows at like 50% and sometimes when I start the car, it putters up and down and then
turns off. Radio also doesn't seem to get as loud.

From everything I'm researching, this appears to be a bad ground somewhere.  As in components are not
getting enough voltage.

Considering all of these things are affected, any clue where I'd begin to fix the wiring/ground issue?

The shop I went to didn't want to acknowledge they may have caused this in any way. It does seem like it
shouldn't have but I doubt it was a coincidence that this happened immediately following the work they did.

Any ideas? Thanks!!