Morning, sir!
Not talked in a while. But maybe I can shed some light on what you have?
Looking at the parts lists for that pre 2010 age group, we don't get the best interactive stuff with nice pictures but more of a simple list style. But we can drag up some info that we can relate to other sources of info.
The main parts list for your RV is here:
https://www.winnebago.com/Files/File...GO/3wf331c.pdf
And if we drag down to about page 78, we get the info on the converter with parts number!
That age group was where it was in transition as all things electrical do. There was the converter, which was built as part of the load center and breakers. Then there was a small inverter added for really small uses like powering a cell phone charger, etc. Maybe a really small TV? The inverter was only 130 watts, so two 60 watt bulbs! Inverter was often hidden in some cabinet, possibly behind the TV or whatever outlet they served.
But the converter is built as part of the whole load center and not a stand alone item that makes change easy. It is normally high enough output to do what we need at 45 amp but not a terribly precise thing for maintaining the batteries as it tended to run too high voltage and try to boil the water off on batteries.
Not the nice charging with several stages and auto regulation that newer chargers might have.
To get a better picture, I used the part number 083208-02 to do a search and found that charger type was used for years and years with only slight changes made giving different last two digits like -07. That leaves us not quite sure exactly which model might be on your RV but mostly the same??
For pictures, I went to a 2011 model where we can use the interactive parts and got this look at the basic converter/ load center you likely have.
It seems to be a 45 amp converter for many, many years.
Click these snips to get a better view?
Front view
Back view with fan for cooling the converter showing it to be in the lower section but built together as a single unit with the breakers.
I've never got into changing the converter but it would seem to be a bit of job as one would have to add a newer issue, remove the cables from the old and rewire tot he new both on input from the AC supply and the output to the breakers and batteries.
Could be done but quite a challenge?
For normal use, the converter seemed okay and I never used it enough for storage to make me want to change it.
My easy out for storage was to turn off the converter and just use a newer design portable charger that does have the stages. Most of the time I let the converter get the batteries back to ful charge as we unloaded and then killed it an added a tiny little trickle charger to cover for the safety items and normal voltage loss while storing.