A clamp on ammeter is nice to have (make sure its DC) but the wrong tool since you won't be able to use it while you're driving. You want one of those digital voltmeters that plugs into your cigarette lighter.

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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