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Old 11-12-2014, 11:00 AM   #15
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1981 22' International
1967 17' Caravel
Cheyenne , Wyoming
Join Date: Jul 2010
Posts: 15
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."
Andy
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Andy Rogozinski
Inland RV Center
Corona, CA

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: deccli@wyoming.com. Thanks so much for the info and offer to help. Im sure well meet down the road. Now I just wish it would warm up a little!
Deb
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Old 11-12-2014, 09:41 PM   #16
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Quote:
Originally Posted by deccli View Post
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."
Andy
__________________
Andy Rogozinski
Inland RV Center
Corona, CA

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: deccli@wyoming.com. Thanks so much for the info and offer to help. Im sure well meet down the road. Now I just wish it would warm up a little!
Deb
The transformer that you have called a Univolt, cannot charge the battery.

Therefore when your in the boonies, your out of luck for anything electrical in your Airstream.

Installing a current Univolt, is very simple.

Take all the wires off the switches.

Divide them up and tie them into a fuse panel that is separate from the Univolt.

A new Univolt has 3 wires, plus, minus and ground. Pretty tough to go wrong.

Then, when plugged into city power, the Univolt does 2 things. It provides power for your lights and fans, and at the same time, charges the battery.

Should for whatever reason the city power failed, or you want to operate self contained, you battery is at 100 percent, ready and able to keep your Airstreaming top notch.

It's a win, win, win for your happiness.

Andy
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