Mastr teknishun
Even with the Prevost 12v and 24v (one of each) disconnects off, you have a parasitic draw on the chassis batteries that will pull them down in less than two weeks to a point where they will not crank the bus. The only good solution to this is to install (if you do not currently have one) a charger for just the chassis batteries. All you need is a couple amps at 24v to do the trick.
With the switches on, key off, the batteries will last less than 3 days before they are too low to crank.
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