Quick follow up... turns out one of the cables going to the field windings was pretty frayed, which was tripping out the EV100.

I had two different techs come in to look at it, the first screwed around for almost an hour and told me that my brushes were worn unevenly. He never came back to put in the new brushes, but did send me a bill for 2.5 hours labor - AND $40 for the new brushes. Yet my lift still didn't work.

The second guy came in, took about ten minutes to look over the truck, found the bad wire, replaced it, and left. No charge - he just told me now I knew who to call if I ever have any more problems. That was Dunrite Industrial Repairs out of Morrisville PA. Nice guy and clearly knows his stuff. The truck's worked perfectly since.