24 volts went thru my car...

So playin at the shop one of the guys gets a garrett turbo and puts a 12/24v motor on it. It pushes enough air to cutly boost a 50cc motor at 12 volts. 2 batterys 24v it has a kick even!

It ends up getting hooked up to my ef with an extra battery running at 24 volts. Thinking it would be ok because the ground went to the aux battery not the cars battery he starts the car turns on the ac chills for a min then goes under the hood and hits the switch a couple times. Takes it for a run and notices the AC stopped working so he comes back and asks....

I since have had the alternator checked, Replaced the ELD or under hood fuse box. Engine Coolant temp sensor. secondary injector and got an extra ecu for a stick (Car is auto)

still throwing codes 6 10 13
Does anyone know where in the wiring these pieces come together?