WFCO has a reputation for making converters that do not work when new much less 16 years old. When I bought my current TT, the brand new WFCO converter would not go into bulk charge mode. It would put out 13.6 volts and no higher. Rather than deal with a warranty issue and get another WFCO, I personally installed a Progressive Dynamics 45 amp converter. It worked great the day I installed it and still does now. I installed a PD my last Class C in 2010 and it was still working great when we sold it in 2017 after 60,000 miles.