...ONE SHOULD ONLY USE THE "BOTH" POSITION IN AN EMERGENCY, where an emergency is defined as NEITHER battery alone will crank the engine. Keeping the switch in BOTH position under certain battery conditions can ruin the batteries.
, I NEVER use Both unless neither battery on it
Aside from battery damage, I thought that having it set to both, cranking the motor and attempting to let the alternator charge both at the same time to damage the diode in the alternator? I was under the impression that if you needed to parallel the batteries to start the motor you should parallel them, wait 10-20 minutes, disable or switch off the combine or parallel and then attempt to start as normal.
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