I have a Generac model# MC5500 portable generator that was last run over a year ago. At that time it did produce good power. I started it today. The engine ran but produced no power. I have known that these things must run every so often under electrical load to keep from loosing their magnetism. My fault for not having done that. Does anyone know the procedure for re-exiting this thing so as to getting back it's magnetism and working normal again?