I think my son is getting a little irritated with me. He's adamant that this is the way the 1967
Univolts worked back then. He says the Univolt on city power puts out 12V
AC. He found this post on another forum, it is somewhat relevant:
"What your calling a Univolt, as Airstream also called it, is nothing more than a dual output voltage transformer. It really has nothing to do with a battery charger, since within itself, it cannot charge the battery.
There are 2 switches controlling what energy source that's fed to the 12 voltsystem.
If the switches are on city power, and your plugged in to city power, then all should be fine.
If however, the switches are on battery, since you do not have a battery in the trailer, nothing will work, when your on city power or not.
With the power supply you have, the 12 volt
AC output feeds the lights. The 19 volt AC output, feeds the fans.
You can update the system by installing a regular Univolt, that supplies power to charge the battery and to operate all the lights and fans. It's not a big deal to change out the system."
Inland RV Center
We plan on taking the trailer to Luke Bernander in Fort Collins to put in a gray water tank and work on some other problems. I think I will leave the Univolt the way it is for now since I know what is doing and doesn't seem to be causing any other issues. I would appreciate the schematics to see if it is different then what we have. Here is my email if it's easier to communicate: firstname.lastname@example.org
. Thanks so much for the info and offer to help. I’m sure we’ll meet down the road. Now I just wish it would warm up a little!