Some months ago while having other repairs done on my coach, I asked the mechanic to check the "voltage system".
He said my power CONverter was weak...and altho it still did the job OK, it was (according to him)borderline failure.
He recommended I get a new one and the installation was so simple, "even you can do it"
So...going online I found a PARALLAX 55 amp unit for about 200 bucks. My coach is a 2001....and the "new" technology...what a difference. The old one was HUGE and heavy. The new one is very lightweight and small. 2 wires and a copper chassis ground. Mounting it was no problem, however, due to the difference in the size and location, I could not use the screw-holes provided in the new unit. It's so light...that I used a strip of VELCRO to keep it from wandering around. It works!