There are a strict set of procedures whereby a generator is properly set up using a device called a load bank. Proper testing would also verify a faulty voltage regulator as well. Only qualified RV technicians should attempt to tune a generator. If your local RV center is not familiar with generator tune-ups, we have produced a professional technical training videotape detailing those exact procedures. If you or your shop is interesting in obtaining the tape, simply send us your mailing address and we'll send you the ordering instructions. I wish I had an easy fix for you, but measurements must be taken and the generator adjusted correctly before diagnostics can continue.