I have an Admiral ADG7005AWW dryer. The timer dial has stopped advancing, so the dryer just stays on indefinitely. I'm trying to determine the problem.
This troubleshooting guide says it could either be the timer motor or the cycling thermostat. I've tested both of them according to the instructions given on that page, and both passed the test. I took it farther and tested the cycling thermostat to make sure it is closed at room temperature and open at hot temperature using a hair dryer, as described in this video. It worked as expected. I even check the third terminal (orange wire in the wiring diagram) to make sure that it toggles opposite that of the purple wire. Again, works perfectly.
I tested the timer motor resistance, and it is 2.4kOhm, which is right where it is expected to be. I can manually turn the timer, so I don't believe it is mechanically blocked. I also rotate the timer through its full rotation and confirmed that the internal switches are connecting the YL-GY connection properly and the GY-OR connection according to the "cycle schedule" that is at the top of my wiring diagram.
What's left? Why else would the timer not advance? The dryer works otherwise.