You obviously had an inverter (a device which converts 12V DC to 120V AC) and the Montana's do not have standard (or as an option) one. The good news is that it is easy to install one and have it supply the entertainment center in a 3700. I did it as the first thing I added to the rig.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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