I think ours is 12 volts too.
But now I will have to go out and check.
Memory is not as good as it once was but it is not alone.
Yep, I checked 12 volt fan in 2010 Flagstaff.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW