I wish I had room for a 2nd cranking battery. I have the oil reservoir where it could possibly go, but until/unless I switch to a 4 stroke engine, I’m out of luck. Thanks

Thanks for the advice! I had forgotten about the voltage tester up front, which explains the extra red and black main wires. The only other wires are lighter gauge reds and blacks for each battery, which I’m assuming go back to the charger, but can use a tester to verify.

I wonder if I should also run my sonar off the trolling motor batteries? I’m getting a new Lowrance Elite FS to replace my 25 year old Lowrance X25 and even now the X25 resets when I run a spot light off the cig lighter plug, as I think the light is too much of a load given I only have one battery in the back?

Thanks.