Q: is there a kill swtich? when you replace the batteries? on 2009 Chevrolet Silverado 3500 HD

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My brother in-law has a 3500HD 6.0 gas it sat for two weeks in avg temp below 32 degrees it won't start, no lights no anything. I took out the batteries to test and charge them. one was bad (main) other aux battery held charge under load Is there a kill swtich or procedure for restart after battery replacement? Thanks
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