Update

I cooked things pretty good over cranking.

Solenoid was not functional - no pull in.

And 2 of the four brushes had overheated and unwelded their copper braid connections at their terminals.

Try until you die, those starters give it all until the moment they can no longer.

Damn I have a good battery that allows so much cranking, it's a MB brand battery been in there for the 5 years I've had the car.

Assembled one good starter from all the parts of others I had kicking around. Eventually re-wet everything and bled out air, etc.. Got it going.

But lesson learned: no more than two or three long (15-20 sec) cranking sessions per half hour, to allow that starter to cool down.

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Cheers!
Scott McPhee

1987 300D