The model of the converter should be visible once you open the converter door. The label should indicate the manufacturer and model. In case you don't know, the converter has circuit breakers and some small automotive type fuses that act acts as the "breaker box" for your coach. All converters have a cooling fan that cycles on/off based on how much current is being drawn from the converter. If the current demand is too high, you may hear the fan in the converter come on and run then shut off and the lights will get a little dimmer as the converter shuts down and you're running only on battery. Once cooled down, the converter will turn on again and then repeat the cycle if the overload is still there.
A couple of years ago I had one that continued to cycle on/off with nothing attached. It would run for about 5 minutes, producing the right DC volts, the cooling fan would turn on and then the converter would shut off. I could have replaced just the converter charger part, but I wanted to upgrade the capacity, so I replaced the entire unit.