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G’day from the Great White North eh hoser.......OK so much for the Bob and Doug McKenzie impersonation fellow Albertan: Not familiar specifically with your coach but......
1. 12.1 volts is probably between 25% and 50% state of charge.....but if you assume 50% gone then the A/H draw is about 1/2amp or less per hour (assume load in use 24 hours/day for 14 days) unless I goofed somewhere on the bean counter. So how about any devices that are hard wired off batteries like your gas detector; radio memory off chassis batteries usually; hard wired inverter via fuse not passing through battery disconnect perhaps.....or I have heard of some radios bypassing disconnects.
2. Steps are usually powered from chassis battery. They may not be dead, but could be below some threshold the step controller requires to function properly.......measure your chassis battery voltages and check your step manufacturer’s info on minimum voltage/current requirement. Not sure if they spec that though. Load testing all batteries is the best bet but not easy when the weather is crappy.
3. Bird info says either battery string being charged at minimum 13.1 VDC for 2.5 minutes will connect the strings together.
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