Fred McKenzie wrote, on Sat, 20 Dec 2014 14:16:45 -0500:

So the battery is apparently charged when the generator is running. It
is not clear if it is also charged through one of the three transfer
switch connections. SW2 may be an option you can set to allow that, but
I did not see any mention in the manual.

Hi Fred,
Thanks for confirming that information from the schematic in the
owners manual.

For others to see that schematic, I've converted the entire 32
page PDF manual to JPG using the following Linux command:
$ convert -density 300 generac_9067-9.pdf generac_9067-9.jpg

While all 32 pages were uploaded, the specific page 12 Fred speaks
about is located at the URL below (rotated sideways for convenience):
https://c4.staticflickr.com/8/7540/1...beb6437a_b.jpg