For posterity, here’s the service manual for the battery charger that’s installed in our Westies:
Airstream Sprinter Westfalia battery charger manual
The info comes from OldFool / OldWest, who posts in the Yahoo group as well as on sprinter-source.com:
According the the Samba thread, the battery charger was manufactured by Cherokee Europe for Westfalia. Cherokee Europe was purchased by its management in 2008 and became Mitra Energy and Infrastructure with a website mitra-ei.com. That name later became Mitra Innovations. Mitra Innovations is now part of Alpha Technologies.
If you’re looking for the location of the charger in your van, it’s behind a metal plate in the cabinet under the kitchen sink.