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AND look at your Alternator's regulator.

It will be apparent if it's easily removable.

Pictures of Alternator from outside source:

http://www.onlinecarparts.co.za/en/electrical-electronic/25073-mercedes-alternator-c220-cdi-s-w-2001-water-cooled-105kw-w203-om611962-diesel-oe-01220aa0r0-0001500550-a0001500550.html

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'84 300SD sold
124.128