facking starter issues. 91 gm w/ 6.2. it rattled the starter mounting bolts out. Rethreaded the holes, installed helicoils, reconnected cable and ignition wire. remounted the starter...now when I try to start it, it goes from 10 volts to 0 volts and the thermostat guage tries to wrap itself....ends with a no start, no crank.....and ideas?