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Yes ac's run off 120vac and 12vdc powers electronics in them to supply the 12vdc to the ostat and do all the high voltage switching as directed by the thermostat (120vac being switched).
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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