I understand they are pads under the tanks. I have three blue switches for the tank heaters. They are labeled: Black, Gray, Fresh. The blue switch lights up when turned on without being plugged into 120 volts. But I'm not sure if the heaters actually come on with 12 volts or just activate a relay for the 120 volts heaters.
Our salesman told us the heaters will keep the tanks from freezing in most cases. But, if the tanks are already frozen they WILL NOT thaw them.
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"What happens at camp stays at camp"
2018 3121RL
2016 Ford F350 SB SRW
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