Is it a momentary switch? Meaning spring loaded that reverts back to the same position when you let go of it? If so it might be to connect the coach and house batteries to self jump start it.
. 2001 Suburban 4x4. 6.0L, 4.10 3/4 ton **** 2005 Jayco Jay Flight 27BH **** 1986 Coleman Columbia Popup
After market add on by a previous owner.. Not a factory install. So it could be anything.
Home was where I park it. but alas the. 2005 Damon Intruder 377 Alas declared a total loss after a semi "nicked" it. Still have the radios Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times