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We also have the 2 x 6V golf cart batteries in series. I have the same marine switch as well. With our old TT we had a key-type switch which disconnected the positive side of the batteries and completely shut off everything for storage. With the Monty, the marine switch was installed so that the CO and propane detectors still work. Our dealer says that they are required to do it that way for safety reasons. He says that the drain from the detectors is minimal, I know better from the previous rig. Luckily, we've been able to go out with Monty every 3-4 weeks so there's not enough lapsed time to drain the batteries. Also, we're lucky enough to have a power source in the yard we store the rig and they don't mind our hooking up to keep the batteries charged.
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