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Old 01-10-2012, 10:12 AM   #29
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2010 30' Classic
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Yes, unless you disconnect the umbilical.

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Old 01-10-2012, 10:30 AM   #30
Rivet Master
2010 27' FB Classic
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I never had a problem for a short cat nap. But another way to do it is to turn on the 12v heater pads an hour prior to the final stop. That way the blankets and mattresses are all warm when you get there. If staying for a longer time and using more 12v items I just disconnect the TV cable from the trailer to isolate the two sets of batteries.

I don't remember what the mattress pad heater(s) draw.

Jammer, I was still typing when you answered the question. Didn't mean to repeat.

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Old 01-10-2012, 10:25 PM   #31
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In most modern TV's you won't drain the battery with the U cord plugged in if the TV's ignition is off. They have a relay that shuts off the charge line if the key is off.
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Old 01-10-2012, 10:57 PM   #32
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Originally Posted by TG Twinkie
In most modern TV's you won't drain the battery with the U cord plugged in if the TV's ignition is off. They have a relay that shuts off the charge line if the key is off.
Some time back, some TV manufacturers used a diode block to isolate the trailer charge line from the starting battery. Most use a relay these days. There is the remote possibility that the relay could fail or a particular TV was wired without one. To be 100% sure, unplugging the umbilical is always an option. To check if the relay is functioning, connect a 12V test light or a voltmeter to the charge line pin in the TV 7-way socket and observe while your helper switches the ignition on and off.

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