After staring longingly at the diagram some more, I've realized I seem to be missing a relay. I imagine I could get by without it as well, since the simpler (but not as clear) diagram that came with the motor doesen't include one. But I wonder if will be worth it to install one?
Full diagram, for anyone who is interested:
http://www.thunderstruck-ev.com/Manu...ncarWiring.pdf