Either way works to totally disconnect! So do it whichever way makes you happy!
I removed the negative cable from battery #2 then attached a 2 amp solar charger to the positive of battery #1 & negative to battery #2 & this kept both batteries at 12.2 volts all winter, but was stored in Arizona with 322 days of sun every year also helped.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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