Thank you, Moose! The plugs do work when the generator is running but other than that they do not. It seems my radio/speakers are powered from the starter battery and so are some of the interior dome lights, which leaves me wondering what the auxiliary batteries are made to power? Only the furnace fan, water pump, and AC?
PS I have the original manual for the vehicle and some pretty cool Clark brochures that have been saved by the guy who bought it in the 70s. If you’d like to upload them to the site. Let me know and I will scan them in.