Any electrical experts out there? Conventional wisdom has it that you should not turn off a battery if the engines are running because you will damage your alternator. What happens in the following situation? I have a port alternator and a starboard alternator connected to a battery isolator. On the output side of the isolator, I have a port battery, a starboard battery and 2 house batteries. What happens if the output wire to the house batteries comes off while the engines are running? I think this is the same as turning off the battery switch. Will this harm the alternators? I don't think so since the isolator protects the current from going back into the other batteries so, the alternators would not know that the house batteries were disconnected. Am I missing something? Thanks.