Your year model and Brand you should have a Converter. Now, for your specific, problem, the first thing I would check is the condition of the Coach Batteries. Water/test of all the coach batteries. When you have a defective cell or bad battery/s(just one of multiple will cause a problem), the converter will act just like you state. The Battery Charge portion of the Converter, may be trying to charge and the defective battery/s are causing a higher amp load causing the 12 volt system to spaz out. Usually a bad converter will just be BAD, and not go in and out every 30 minutes or so. The fact you hear the Genset surge for a demand points to this. IF the batteries check out, I would kill power to the Converter charger section, for a couple of hours and see if the lights continue to dim. If so, then I would probably replace the Converter. Especially if it is over 20 years old. Doug
