Re: Battery Selector BOTH load
I thought that in my current setup I cannot move the selector switch while the engine is running or the alternator could be damaged? Does that device allow you to do that?
Battery selectors are supposed to be "non-interrupt" switches. Thus, they let you switch from "1" to "BOTH" to "2" without completely disconnecting, or interrupting, the batteries between the settings. The thing you don't
want to do is to switch the selector to "OFF" with the engine running.
Also, to clarify (OK, actually correct) my earlier answer--
If you set the selector to "BOTH" once you get the engine running the drained battery will tend to charge very slowly, since the voltage regulator will be "fooled" by the not-so-drained battery. So, it's probably best to get the engine going, top off the "good" battery for a little bit, and then switch to the drained battery to more efficiently charge it. The way most boats are wired, you're really only supposed to use the "BOTH" setting when neither battery will start the engine on its own.
Never forget them. Do something to prevent it from happening again.
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