Thanks for the replies. I'll try to give a complete description of what I did, I'm new to this so I tend to not take much for granted. Drove to work this morning, parked the car (engine still running) and disconnected the wires going into the glow plug relay... this was a black box above the front driver's side wheel well, with 2 clusters of wires, each with square plastic connectors that attached to a small grid of pins. There was also a thicker wire held down by a nut, but I assumed that was a grounding wire and left it alone. There was no increase in voltage when I did this. I never get anything above 13V. Any more ideas? The V-belt is definitely spinning the alternator, which should result in SOME electricity generated, right? Maybe the wiring from the alternator is faulty... how can I measure voltage directly from the alternator?

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1985 300DT, Classic White, California, 175K
1984 300TD, Classic White, Euro, 285K


"When nine hundred years old you reach, look as good you will not. Hmm?" - Yoda