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There are UnFused circuits that can go "Bad"
The Alternator Diodes are one example.
A Stuck Pre-Glow Relay is another.
(Either one of which will drain the Battery)
Schumacher Electric has a Tutorial Page that walks you through Automotive
electrics 101:
http://www.schumacherproducts.com/applications
These Two pages are my favorites:
http://www.schumacherproducts.com/applications/?id=0007
and
http://www.schumacherproducts.com/applications/?id=0014
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'84 300SD sold
124.128
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