Originally Posted by Joey
Would putting an extra ground cable from the battery to the frame help, mabye. Could the alternator be messing up inside and causing it to short to ground.
An easy way to diagnose where you need an extra ground is to hook up a jumper cable from negative side of battery and then hook other cable end to frame, battery, trans...etc. when the starter cranks normally thats where you need to add a cable. if no difference, attach positive side from battery to starter terminal. This test should help you diagnose and pretty much pinpoint your problem.
usually the problem with alternators is no charge or draw. if its not charging you can do a simple voltage test. voltage draw(parasitic draw) will be wierd cause they charge battery but become a draw when not in use. The diode triple which changes A/C to D/C will go bad and allowing battery voltage to back feed alternator causing the windings to become a heater. Draw will discharge battery overnight. so with engine cold the alternator should be same temp, if it feels hot its bad.