I had the chassis battery issue as have many. The knife-switch was the fix.
When I installed the switch I took a moment to stick an inline ammeter on the chassis battery to actually measure the parasitic drain. I don't remember the numbers, but they are posted here on the forums somewhere. What I can remember is that the drain is approximately 1 order of magnitude (10 times) what one would expect it to be.
All modern vehicles have a small drain to keep the various computers and clocks alive. Something else (perhaps many somethings) is sucking our batteries down.
Regards,
Randy
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