An early morning wiring session got me to the point where I need to fire it up. I connected the negative side of the battery pack for the first time, and cautiously flipped the breaker: No smoke.
The Alltrax had the the LED indicating green, but when I twisted the throttle gently nothing happened. Fully opening the throttle turned the LED red. Panic!
I then realized I hadn't engaged the contactor. A flip of the switch and the contactor clicked closed. Now the rear wheel spins happily in response to my twisting wrist.
Cue Oingo Boingo's song "Weird Science"