I don't have an ammeter, but I test the alternators by measuring voltage across the battery terminals. Not charging =10.5-11 volts. New alternator and new voltage regulator = 13.4-14.1 volts, and it goes up with RPM. I also test by starting the car and removing the positive battery cable. Lights and wipers off, not charging. Lights and wipers stay working, charging.

I didn't test the body/engine grounds because I assumed them to be working. Wouldn't the car have all kinds of wierd electrical symptoms with bad grounds, charging system aside? A $5 battery ground and an auxillary engine ground couldn't hurt it, so I'll do that next.

When the charging system dies, I put the Diehard on a charge overnight and it takes it and stores it as it should. I'm pretty ruled out on the battery itself.

Where is the glow plug relay and how I can test it armed with my voltmeter?

Thanks a million guys,
Kip Amore