Series will get you more (combined) voltage - Parallel with get you more amp hours. I agree with JA - you shouldn't have a 24 Volts system. Series the positive cable from battery 1 goes to the negative post on battery 2. Parallel its positive to positive and negative to negative...
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2022 33RBTS
Progressive Industries EMS - Hardwired
Equalizer 4 Point WDH
2021 Ford F350 7.3
Air Lift Rear Bags w/ On Board Compressor (Pending)
2016 28BHBE - (Traded and Missed already)
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