I have a Kenmore Series 90 dryer. In either the auto dry mode or the
timed dry, the timer doesn't advance, at all. So the dryer continues
to run. If I move it manually to Off, it stops. The heater element
turns off correctly when the timer is turned to the Off position.

Before I got and drop $85 for a new timer, I'd like to know if that is
the problem or if there is another component that might be bad.

Anyone have any experience with this problem?

Is there a signal coming in to the timer module telling it to advance,
or does it advance all on its own?

Thanks...