When the alt ground fails, you'll get no charging and no alt indicator light. The lights might dim a bit as they start running off the battery at ~12V instead of the alt at ~14V. In my case (different car), the wire had corroded away from the push lug. Not even 65+ MPH saved the day.

Wedding days can be so much fun.

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'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png

Broadband: more lies faster.

AFAIK, the alt is grounded through the case via the three 17 mm mounting bolts. I can't imagine how that ground can fail.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked