Name:   F1Fan - Subject:   Dual battery use question Date:   2/25/2020 11:27:41 AM

We have dual batteries on a 1-BOTH-2-OFF switch. Other than the time we realized one was weaker than other and needed replacing have run boat on BOTH setting with good results. A few times when we've been anchored for an extended time with stereo on, lights, etc. have swapped over to just one of them as insurance that if we ran one down, we'd still have a second to get home.

I believe the one thing you have to be very careful of is never to swap from one to the other via an "OFF" setting in between with the boat running. I think this risks damaging the alternator if I'm not mistaken.