Right, I've had glow plugs too............
Mine kinda works the same way in that it's on a timer. I turn it left till the light goes out (30 sec to a minute), then right to crank it over.
Since I have a clutch safety switch, it works the same way if I turn it to the right and hold it in the start position, but don't push in the clutch. When the light goes out, I kick in the clutch while still holding the key in the crank position, and it cranks and starts.......... but, the light always goes out and stays off when it's running. Hope I'm not confusing you more!