Converter problem?

I have a 2001 camper but the converter went bad about 4 years ago and I had it replaced. The documentation on the converter is at the camper so I do not know what model it is, but I do know that when left plugged to shore power for extended period with the battery hooked up, it will overcharge and burn the battery up.
I guess I will look into maybe seeing if I can buy the module that hooks to the converter to control the charging process. I believe that the converter I have has a port for this option.
Thanks for the info,
Mike