Well this is just a hypothetical question brought on by a friend of mine telling me he made it 20 minutes after his alternator died on his Lumina... I was thinking, with no spark plugs and much less of an electrical load, how long would a diesel engine run without any alternator?
Seems to me only the ECU would need power (no electric fuel pumps on a diesel right?), lights could be disabled by switching them off and pulling the parking brake up far enough to activate the DTRL shutoff - but not enough to apply the parking brake.