Gary:
In 1962, most Airstreams had two separate electrical
circuits, one 12 volts d.c. and the other 120 volts a.c.
Some appliances, like the exhaust fan, had two switches, one
to operate it from the 12 volt battery and another to
operate it from the 120 volt a.c. side, likely via a
transformer to 18 volts a.c. Your light fixtures should
also be dual voltage.
Your original water system likely had an air compressor
(to fill the storage tank with air and thus move the water)
instead of a water pump per se, but the air compressor also
may have run on both 12 vdc and 18 vac. The air compressor
may have been replaced by a water pump during the last 41
years. On a warm day, poke around you trailer a bit and see
what is there now and enjoy the bonding. :)
Fred