The pic didn't show up (at least on my end). Based on your description, I'd guess it is for your awning LED lights if you have them. That is the only big black switch on mine in the area. Helps to know what unit you are referencing.
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2019 Ram 3500 Limited w/ Max Tow pkg
2005 Cardinal 33LX
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3) SOLD!
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