The intermittent crank with key persists and I have not isolated the problem or replaced any parts yet (I hate replacing parts by trIal and error). The no crank with the key usually occurs with a hot engine, but it always starts if I jump the terminals on the fender block, or if I turn the key 5 or 6 times.

Anymore theories as to what the problem is? If it's the elec ign switch, why would it care if the engine is hot or not? I think I'm gonna wire in an analog ammeter to measure starter solenoid amperage.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked