RE: Fuse on starting battery
A second problem is many alternator outputs simply go to the starter terminal.
Its close , and the wiring is always ample to handle the alt output.
Should a fuse disconect an operating alternator its usually diode time.
Have the press and spare diodes aboard?
A good rotary switch and proper wiring solves this.
There is (on a good rotary switch) an alternator field power terminal.
It breaks the alt field before disconnecting the selected batt.
Connects the batt , then powers the alt , when selecting a batt.
GREAT INSURANCE , if your alt is hooked to the starter.
IF someone were to go to the trouble of rewiring to install a field disconnect switch , I would add a manual switch in the event of V reg failure, with the chance of over voltage charging, boiling battsets.
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