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^^^^^The thermostat will be 12vdc. Look inside of it, if like mine and others you may have the lugs labeled +12vdc/-12vdc etc. - or, throw a meter on it while it's operational.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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