Thank you for the quick reply wolf, to clarify the draw is on the chassis battery as diagnosed at an auto/RV repair shop. They traced this 20A draw to Fuse #68 in the power distribution box located under the hood, not the passenger compartments fuse panel. This panel contains the high current fuses. They said this should be an unused circuit, their shop manual (F- 450 chassis) indicates “ 50A Modified Vehicle”. Their hunch is something on the coach side has been connected to this. So I pulled this fuse myself, tried all chassis switches and curiously enough I lost the power/heated mirrors function, (quite the hunch on your part!). Please note also their is NO fuse labelled “mirrors” in this power distribution box. There is a 5A fuse labeled “mirrors” in the passenger fuse panel according to the owners manual. I haven’t found this fuse box yet.Should I pull this fuse again and see if the battery stops draining? All I’ve got is a volt meter, do I need to buy a clamp style DC Amp meter to confirm “0” Amps at the chassis battery?
I thought I should mention the auto transfer switch replacement because that is the only electrical work performed on this unit. Everything has been working perfectly till that drive home when the GPS portion of the in dash radio suddenly froze, it’s still showing the map that was up at that moment. The only other change is the over cab TV, it was always “on” (Power LED illuminated) whether the Xantrex Inverter was on or off. I just used the battery disconnect switch to deal with this.
Now it has NO power running to it, unit plugged in, genset running, MH idling or Inverter on. Haven’t tried just plugging it in with an extension cord from the house, I’ll try that right now. I bought this unit in July this year so still getting to know how everything functions.