They would have to be connected in parallel. Negative to Negative and Positive to positive. Wiring them in series would turn them into 24V
Unless you mean the batteries are 6V then series would be correct.
https://batteryguy.com/kb/knowledge-...s-in-parallel/
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Dan & Serena
2019 GMC SIERRA 2500 HD SLE
2015 Cougar X-Lite 29 RET
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