"Boatowner's Mechanical and Electrical Manual" [Second Edition] by Nigel Calder
[International Marine/McGraw-Hill Companies]

Your local library will have a copy.(Or they can acquire through Inter-Library Loan)

The Information in this Tome is INCREDIBLE !
(AND it's almost ALL transferable to Auto/Aero Motive applications)

For instance, In the book, Mr. Calder details correct testing procedure for
Alternator Diodes !!!

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'84 300SD sold
124.128