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If it is cold enough for tank heaters, you probably will have all three switches on. No easy answer to really know which is on. You could use a temperature gun to see if you can detect any change in temp on the bottom with only one switch on...but my guess is you won't be able to tell. John
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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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