Welcome to IRV2! We're sure glad you joined the gang!
I think that most aux start solenoids are activated by grounding one terminal. Use a voltmeter to see if there is a constant positive 12VDC to one side of the coil. If so, momentarily ground the other terminal to see it it activates.
Good luck, happy trails, and God bless!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD