Originally Posted by Aage
This circuit is called the "shunt". If you are interested in it, look in the Search, there's plenty of info on how to deal with it if you have removed your Univolt.
The shunt circuit is a different thing from the "power on" light circuit. It is used to measure the + or - amps in or out of the battery on the older Airstreams. It is an ammeter circuit, using a shunt built into the old Univolts so only a small amount of current needs to be run to the actual meter in the control center.
So, actually there are two small wire circuits that feed information to the display/control center. One is the power on light, the other is the one for the ammeter fed from the shunt.