Greetings, We have a problem with our coach batteries draining quickly and not charging while driving (They will charge on shore power and on the generator.). We experienced several electrical grimlins which lead up to our present situation. First symptom was a dead starting battery - we replaced it have had no issues. Second was a warm fridge and tripped circuit breaker, followed by dim lighting and finally the charging issues. Running with the generator or being plugged into shore power solves all problems electrical. The fridge works on LP meaning the 12v to board is working. The AC, microwave and fridge will work on both shore power and the generator. Autozone checked the two 6 volt coach batteries and saw no problem. They are original and probably should be changed. I am reluctant to tear into the electrics too much but simply do not have the money for a $100/hr RV shop to perform troubleshooting. Are there any ideas on how to simplify the troubleshooting process? If so, perhaps we could narrow down the fix and thus afford the professional repair. Thanks in advance for all your help. It's cold up here and Michigan and I have lots of time to work on the RV.