Very strange findings. This morning I took the chassis battery out and topped it off a little bit with distilled water. Found 1 cell with slightly low water. It was at 12.63v in morning and same at 4 pm when I got home. I took it to a battery shop and they said it's older but still has life left in it. Should be good for another year or two with care. I took it back to the RV, cleaned the electrodes and the connectors and reconnected it. The RV started with no problems and EVERYTHING WAS WORKING! Weird!
I checked the voltage at battery before starting up and it was 12.6, and after staring up, the alternator kicked in and it was at 14.28. Same for the house batteries. It was 12.89 before starting up and it was 14.28 with the engine on.
I then turned off the engine and hooked up the RV to shore power at 15amp power cord. The AC system kicked in but neither the house batteries nor the chassis battery voltage went up. It looks like when I plug in, the AC system runs, but the batteries are not charging up at all. I'm assuming then that this means that the converter is not working? If so, where do I find it and which one should I replace it with?
I think Dale has it right that the converter maybe the culprit. A weak and older chassis battery that was inadvertently drained (maybe I left the headlights on somehow???) masked the real culprit.
I found and opened up the BCC in the front of the RV but I'm not sure where the converter is. I was expecting to find a small standalone box, but not finding it.
