I have a 99 jimmy 4.3l and I had a problem the other night driving down the road I lost power and the motor was surging on its own. I limped it home and next morning it was completely dead. I had a buddy jump it and it started, then I went to drive it and when I hit the gas pedal the voltage meter spikes to max and then I hit the brakes and it drops to normal at 14. Would this be an alternator issue or battery or voltage regulator, Im lost!