I have a 2009, 392FLFB. The converter fan would run all night with nothing running. After a couple of years, the lights would dim, and the brighten again. We have a voltage problem in the park that was solved with an autoformer, but the incoming 120 shouldn't affect the 12v system regardless! Finally replace just the converter, not the panel, with a Progressing Dynamics Converter w/Charge Wizard. No more fan, ever. No dimming. Two other reviewers on Amazon had same problem as I did with WFCO. Easy change, and nice to never hear the fan running.