House 12v problem

[Fastcarrs]

First the Coach is a 2007 Excusion 39v. Have only had it for 8 months up until now 0 problems. Now for the first time it has sat up for about 2 weeks without having it plugged into 50 amp. Went out to start it up and the generator to exercise them. And I have never before turned off the house and main batteries. So turn on the main engine starts fine let it warm up, fine. shut it down. Go to turn on the gen / house (aux) batteries no power and no reading of voltage on the gauge and no start power for the gen. So move coach plug it in nothing on the 12 volt side still and 0 voltage on gauge on aux batteries. So I replaced the 4 batteries and still nothing. Now though it says it is charging. but the light on the inverter stays green for awhile the goes off for awhile then back on. Plugged in I do have 110v but still no 12v. So I have checked all the fuses all good. On problem #2 have no air for the brakes or the suspension, I can get about 70lbs if I rev the engine high but no more. So I figure the pump went bad.

[Ray,IN]

Leaving the inverter on in storage WILL run down the house batteries rather quickly. If the house batteries are flat, most times the onboard charger will not recharge them. Use a stand-alone charger to recharge batteries to at least 1/4 charge, then the onboard charger works. There are several items that draw power when MH is in storage if you don't use the disconnect switch or remove the neg. battery cable. Mine will discharge the house battery bank in 5 days unless I disconnect them.
Try starting the genset with the drive motor running. You may need to use the coupling switch to link house and chassis batteries.

#2. How long since you changed the air/ water separator filter desiccant cartridge? This is, IMO, the most common cause of air system problems.

["007"]

You need a battery cut off switch on to charge your batteries or what they call a salesman switch on the dash.
If you plug in 110 volts should get voltage in the outlet for converter to charge your batteries.
With the batteries flat as they are now hook up a 12v battery charger for couple of days and get them fully charged.
Make sure you have water in your batteries.
Your Gen starts with your house batteries.

[Old-Biscuit]

Battery disconnect switch........

But if you changed all 4 house batteries and still don't have DC did you mark battery cables before removing?
IF you hook up cables backwards there are some fuses on Converter that protect converter electronics from 'reverse polarity'

They are larger fuses (30-40 amp) could be on front or back of converter

IF blown...no dc output from converter to DC system, no DC from converter to charge batteries and no DC from batteries on DC system