Thanks Yank with Ute. Looks like some of the equipment may be hard to find. The manual refers to a "high-rate discharge tester" to be used to test the battery capacity. The local auto supply stores don't seem to know what one is.
Thanks theoldwizard, the manual refers to running it at 1500 rpm for one of the generator tests and some related reading has also suggested testing the battery with a high idle. I think I forgot to run that test the other day. Thanks for the reminder. | 
