To connect multiple 12 volt batteries "parallel" you should have positive to positive negative to negative from 1st to last battery with a positive from battery #1 & a negative from #4 that equals 12 volts at those positive/negative cable ends.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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