Thanks for the link Diesel911. I had actually come across your thread on the other site in googling this issue. I will try to make a test cord of my own. This problem really has me stumped. I also like the jumper cable ground method. I will try that too.

To answer your question, the battery light comes on when i first turn the key (now with the new spliced D+ wire). When I start the car, the light goes out. Checking with the multimeter at the battery terminals with the car running, the new alternator is not charging the new battery, with out without the glow plug relay connector pulled.

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1981 300TD
1984 300D