I have a cardinal but ran into the same situation, battery getting drained even when disconnected. Others sources of 12 volt drain were propane detector, level up system, and slide out remote sensor. I added my own battery disconnect. But there is a reason why certain things do not get disconnected. I was worried about this bypassing the brake pull out switch (no battery power to emergency trailer brakes if towing) but then realized that I could not raise the legs of the battery was disconnected. So I have to connect the batteries to raise legs so I will be ok
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2015 cardinal model 3825fl
2015 dodge ram 3500 dually
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