[sstock6.2]

I have a 2013 2SS (~35k miles) with electric power steering, and can't seem to track down my electrical problems, and was curious if anyone knows any possible solutions. I will list the mods, the problems, and then what I have tried so far. This has been a issue since I reinstalled the motor (~1000 miles ago)

Overview
-2013 2SS Auto w/ tvs300 sc, stage 2 cam, LS3 conversion kit w/ AFM/DOD delete

Problems
-Main issue is power steering, ABS, BRAKE, stabilitrak lights (U0121)
-Remote start only works once after plugging and unplugging PCM
-Primary Radiator fans do not kick on, which causes 210F+ coolant temps at idle (even when it is 30F outside)
-Secondary radiator for supercharger coolant does not engage and the hoses hold no pressure
-Codes for o2 sensor high voltage
-Battery light has come on twice while driving, but goes away shortly after
-On decel and braking, the RPMs slightly jump up and down


Attempted Solutions
-Reset codes (obviously)
-Double checked all of the wiring harness grounds
-Replaced upstream o2 extensions, which had been burned on the headers (and what i thought would fix the issue)
-Tested battery
-Unplugged/Plugged every ABS connector multiple times
-Cleaned every power steering and ABS sensor

?Possible Solutions?
-Pull fuses (have not tested them yet, but I don't think they are the culprit)
-Bad ABS Module?
-Bad Alternator?
-Shot in the dark but I don't have AC so I left the AC belt off when I reinstalled the motor (only thing I can think that I did differently)

Any input or idea is greatly appreciated, I just feel totally out of ideas at this point, thank you!