Well, it has been a long (and expensive) journey to get my electrical system back to 100%, but I wanted to close the loop on this old thread. Maybe it will help someone else.
The pandemic limited my travels over the past year, but when I did use the RV I still had a low (13.2 volt) output from the alternator, no matter what RPM or battery condition.
I took the Windsport to a huge Ford dealer here in the Orlando area. Their diagnostics showed my "new" (replaced by a mobile RV technician) alternator was bad. OK, so another expensive alternator was installed. Unfortunately, although the alternator output was a little higher than the original, the dashboard battery light stayed illuminated. The diagnostic then revealed a bad PCM (Powerplant Controller Module), or more generically; "the computer".
In the end, replacing the PCM fixed the problem and things are running normally. The PCM monitors temperature, engine RPM, temperature and battery voltage to tell the alternator what its output should be. As it turns out, with the PCM dead, the alternator just cranks out about 13.2 volts no matter what.
So there you have it. Quite an expense just to get rid of the idiot light!
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