I had a toggle switch to manually control the glow plugs in my 83 300D (sold). Idea was to use glow only when needed thus lowering total glow usage. Worked great until I left them on one day and sucked the battery down. Added a chime warning and no more problems after that.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked