I currently have my 2 HB's and 1 Lowrance connected to an isolated battery that I charge between trips. I would like to link my isolated and my cranking battery via a Perko 1 - ALL - 2 - OFF switch.
I want this for 2 reasons:
#1. Should I have cranking battery problems, I can switch over to the other battery and start my motor.
#2. If my electronics drain my isolated battery during a trip, I can switch to it and let my alternator re-charge, then switch back to my cranking.

My question: When switching from Battery #1 to #2 Battery, as I understand, the switch passes through the "ALL" position. Does this create a 24 Volt surge in the "ALL" position, and if so, will it damage my Electronics? If anyone has this setup, lend me you knowledge, or how you setup something similar............Thanks