Emergency start switch shorts the chassis and the coach battery; or is supposed to. It works great on ours--you do have to hold it in.
Instead of spending countless hours trying to trace down a phantom load on the chassis battery I just installed a knife disconnect switch. When I park it for storage I open up the switch. Haven't had an issue with the chassis battery since.
I now also have a disconnect on the coach battery and leave both disconnected when in storage. So far both batteries have fared well with the disconnect; even with the coach battery being a crappy Harris one.
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