I don't have one, never been near one, but aren't they mainly used to help cool the trailer? Therefore they would act like air conditioning, coming on when the temp rises, and shutting off when the temp cools. Just a guess.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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