Do yo have a DVM to check voltages? Do you have a wiring diagram? THe starting circuit is very simple. With a wiring diagram and a volt meter you should be able to pinpoint where the problem is.

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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