Need lessons on batteries 101

[bullydogs1]

I have a 2009 HR Endeavor that has the BIRD....went to coach last night....house batteries AOK...Chassis batteries--stone dead....used batt boost switch and coach started...released it and coach died with alt fail...did a second start but held batt boost switch for about 3 to 4 minutes..released it and then coach was fine running....also ran generator for about 15 minutes...

Unit is plugged into 20 amps and house batteries are at float charge..

Solenoid boost works fine..

Does generator recharge chassis batteries? If so, about how long should it run?

I now have a trickle charger on the chassis batteries...

What recharges house and what recharges chassis? And does generator recharge both? Does Alternator recharge both? Why didn't the BIRD keep up the chassis batteries?

Will BIRD not engage if float charge and only engage at Bulk Charge?

Hopefully someone out there has the correct and definitive answer. I called Monaco and was not satisfied at the explanation..Something didn't make sense with the BIRD explanation.

Thank you.....

[Diplomat Don]

Stuart......This is how it SHOULD work....When the engine is running, the alternator charges all of the batteries. It generally looks at the lowest bank first and charges them and then will charge the others. It will switch back and fourth between the two banks as necessary.

When on shore power or generator, your coach batteries will charge and so will the chassis batteries if the BIRD is working properly.