Spray some white lithum grease on the negative cable, it's got acid on it.
Voltage regulator is intergral to the alternator, held in by two screws. Make SURE you have both battery cables in good condition and properly connected, and that the body ground is good, or the ignition may be cutting out with engine movement.
Check the voltage across the battery at idle and at 1500 rpm or so -- if it goes over 15 volts, the regulator is shot. These usually fail open, though.
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!