Have you tried the fan with the ceiling light on?
In many rigs, for reasons unknown, the vent fan is only powered with the ceiling light ON. If you want the vent fan ON and light OFF, you have to turn the light off with the little switch on the light fixture.
UPDATE: Just noticed you have a Pup. What I stated above probably doesn't apply (although it might.)
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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