If you are worried about it install a "zap stop"

Some switches if switching from "1" to "both" to "2" will make before
breaking and not zap your alternator. If you battery switch opens or if you
go through "none" then yes you may fry your alternator.


"ray lunder" wrote in message
...
The AmplePower people agitate for strict prohibition on this saying it
will smoke the diodes in your alternator. Is this true? What are you
supposed to do? Start the boat with the starting battery, let it run
for 10 minutes, turn the engine off and start it again with the house
batteries and charge them under way? What say all of you?