I am not very familiar with your Seneca, but there are a number of phantom items that drain the batteries. Like stated the CO detector pulls a little power, gas detector, built in entertainment center, even when turned off.
You can go about a week or two before the phantom will cause power issues. flipping the disconnect switch will eliminate all phantom power drains. But it also eliminates being able to walk in and turn on the 12V lights too.
For this reason, I typically connect to shore power with a 15 amp extension cord from the garage between trips. Works well if you park at home, but no so much if you leave it at a storage lot.
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