The 120 volt , black switch with led . Yellow box would be for the water heater on shore power .
Is the second switch , the 12 volt one below the thermostat ?
Can you post the make and model number of your furnace, and brand of thermostat , maybe we can direct you to a users manual for it..
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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