Depending on the truck, most newer ones have a relay that connects the truck and trailer, only when the truck is running, or the key is on. It prevents that very thing, discharging the truck and camper battery while connected, and the truck not running. Might be time to dig out the truck manual and do some reading.
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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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