If you have a Terra, it should charge both the house batteries, and the chassis battery, when on shore power, the engine is running. The Converters do go bad at the 3 to 4 year age, if it is plugged in 24/7. There are 2 30 (0r 40) amp fuses on the converter. Check them to see if they are still good, don't just look, actually measure voltage on both sides of the fuse. You may need to remove the converter from its mount to access the fuses. If you have the printed material that comes with your MH, read about the converter, as it tells you what voltage the converter should be putting out without being connected to the batteries. It should be a 3 stage converter, with 14.2 to 14.4 volts when first plugged in, or reconnected.