Thor Forums

[gmc]

Originally Posted by JoeDS

... I suspect its the BIRDs programming that might be the actual culprit. It is my first motor home so battery handling is vastly different compared to an camper/trailer. ...

Very possible the BIRD could prevent the alternator from charging a completely dead coach battery... Its intent is to protect from a problem in the coach draining the chassis battery (and reverse)... When joining the chassis with coach - and dead coach battery - it could pull the overall voltage down to the point the BIRD isolates the batteries again (below 12v for 1 minute). Depends how quickly the voltage can stabilize between the batteries.

The BIRD would not be in the path of the converter/charger and the coach batteries - so that would be a function of the converter recognizing it is connected to a dead battery...
It would be in the path of the converter/charger to the chassis batteries.

Ed's Axis/Vegas manual has a writeup on the BIRD (Appendix 10) - and most other RV systems... A great reference if you haven't downloaded it already - even if you have a different model.
http://www.thorforums.com/forums/f10...nual-4961.html