I do not know for sure, but I would think it is for a light inside that storage bay
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Frank and Janet Henn
2000 Monoco Lapalma
being pushed by a 2004 Jeep Grand Cherokee
Traveling with Rainbow the wonder dog and now with Sunshine the rescue Schnauzer.
On my ST26BH, that switch activates the front hitch lights. Works great if you're hooking up in the dark, or to add some light around the front of the unit. The lights are on each side at the bottom of the front cap.