I was guessing has this guy thinks a blown shunt could cause a draw!. I'm also guessing it's positve earth as he says" I’m actually measuring 12 V on the frame of the car which is pretty scary. ?
Thats why I think he's no electrician , I could be guessing wrong?
Mike
P.S. I agree a bad electrian is worse than an ametuer who asks for advice!
Mike