Never mind - figured it out.

With ground to chassis:
- 12v directly to the post with th little wire going into the body should drive the motor
- 12v to the small post should actuate the solenoid

On mine, both functions are hit and miss. That is, sometimes they work, sometimes they don't. Even with what I believe are good connections. Like it's stuck. Looks like I was lucky and it failed in the driveway instead of in a parking lot a hundred miles from home.