Actually, this sounds to me like one phase of the rectifier in the converter is bad. Additional symptoms which may indicate this are:
1. With no load on battery, converter charges battery full.
2. With load on battery but not plugged in, lights get dim quickly.
3. With load on battery, convertor does not fully charge battery.
4. With battery disconnected and Rv plugged in, DC system lights go dimmer as you turn on additional lights.
Yes to one or all above could indicate a partially functioning converter, usually due to one phase on the rectifier being bad.
Note that a converter is just a sophisticated battery charger.
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