Take the connector out again and look for green or whitish corrosion on the contacts. Use 600 grit wet dry paper rolled up lubed in soapy water to clean the contacts, rinse, blow dry, coat it with some Nolux (or any grease will do in a pinch) and see it that fixes it.

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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