As I said, the auto store hooked up to it running and it showed the regulator to be the issue. When I had the alt rebuilt, he setup an additional place for me to ground to the vehicle, which I did. The bulb is the same as the last 5 years and this rebuild has been fine for 6 months till now.

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1987 300TDT - 195,000 (Original #14 head)
1993 190E 2.3 - 105,000
1981 300D - 250,000