The charge light stays on after engine shuts down and key is removed on a friend's 83 240D. The light goes of as normal when the car is running. He is disconnecting the battery so the battery doesn't drain over night.

I suspect (but haven't tested) that alternator is charging because the light goes out when running and he hasn't had any cranking problems. Any ideas on likely culprit(s)? He is supposed to bring the car over tomorrow.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.