Illuminated red switches generally control 1. the water pump 2. the LP side of the HTW and 3. sometimes the electric side of the HTW. Where that switch is located I would guess it's one of them.
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2014 Raptor RP300MP w/ Rear Patio Party Deck, Folding Side Ladder, 6 Point Level Up, Carlisle Radial Trail HDs
2004 2500HD D/A CC SB - TTT Mirrors, Prodigy BC, 18K Pullrite Superglide, NEW Fuel Injectors 11/2015 (ouch)
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