First dryer timer stays on and doesn't cycle.we have to watch the time and turn it off manually. then the dryer stops working all together. the dryers in real good shape. do ya think the (TIMER) switch is bad?

dryer timer troubleshooting YouTube

Does the timer advance to the end or does it stop advancing in the middle of the cycle?
If the unit does advance to the end on timed but it won't advance on auto, that means your cycling thermostat isn't triggering. First, make sure your vent is cleaned and the best way to do that is just run a cycle without the vent hose connected to the back of the dryer to see if things change. If your dryer still won't dry properly, then the cycling thermostat will need to be replaced because it's not cycling properly.

Try it on the timed cycle. If it doesn't advance, then you have a bad timer and the timer will need to be replaced.

The cycling thermostat is mounted to the front of the blower wheel housing.

Here is the timer if it is found bad.
Here is the cycling thermostat if it is bad.
Keep me posted!

Hi cayjr1

Clogged Vent
If your dryer seems to run forever, it could be because of a clogged vent or internal ductwork. Your dryer may have an automatic cycle that turns off the dryer when the clothes are dry. It does this with a special thermostat or moisture-sensing system.
Normally, this is what happens during an automatic cycle:
The thermostat tells the dryer to heat until the interior of the dryer reaches a pre-set temperature--say 135 degrees.
When the dryer reaches the pre-set temperature, the thermostat tells the timer to begin advancing. (If there's a moisture sensor, the timer advances only if the moisture content of the clothing is low enough.)
The timer advances until the interior cools, then the thermostat tells the timer to stop advancing, and tells the dryer to start heating again.
This cycle continues until the clothes are dry.
But...if the vent is clogged, the dryer may never reach the proper operating temperature, so it doesn't send the signal to the timer and the dryer continues to run indefinitely, even if the clothes are completely dry. To fix the problem, clean the vent and/or internal ductwork.
Heating Element
Your dryer's heating element may be partially burned out. If it is, your dryer still heats, but at such a low temperature that it takes three or four times as long to dry the clothes. If the element is partially burned out, replace the heating element. You can check for an ohm reading but will need to refer to the service manual for proper reading. This sometimes on the tech sheet located somewhere on the dryer. Usually between 9-13 ohms.
Cycling thermostat
Although this isn't a common problem, one of the thermostats that controls the temperature in your dryer may break and cause the dryer to heat poorly. If so, you need to replace it. The thermostat is usually a small, round, black device mounted to an oblong steel plate. The plate is mounted to the internal ductwork . This thermostat usually has four wires going to it. Check the 2 terminals that are opposite each other and are the closer together of the 2. These 2 terminals should have continuity. If not replace the thermostat.
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Bud

Dryer Won't Stop Running

• Ultimate Car II Dryers are fitted with a mechanical timer that sends an impulse to the control circuit board to stop running once the set amount of drying time has elapsed. This is because, should an electronic timer fail, this would necessitate the replacement of the entire circuit board. Confirm that the mechanical timer is indeed broken by opening the dryer's door. If the dryer stops, the circuit board is working fine and is not the problem. Simply slide off the protective faceplate of the dryer, unscrew the control board beneath, and flip it over. Connected to the back of the timer's knob should be a small round device with two wires running to the circuit board within the body of the dryer. Unscrew this device from the back of the knob and disconnect the wires. A replacement timer costs a few dollars and should screw into place without trouble. Reconnect the wires and put the dryer back together. It should work fine now.
  
• If you need a new timer the best place ti get it is from Rough River Appliance Repair
• Phone number is (270) 230-1818 his name is Charlie and he is the best!
  

1. Does it have electric power? Is the breaker or fuse good? Is the power plug loose?
2. Is the door to the dryer ajar? Please open and close it a few times to check this.

If this doesn't help, you may need new or repaired parts. The timer motor that turns the dryer switch may have failed. The clutch that allows you to turn the select knob for the different dryer cycles may be slipping and have failed. The start button that begins the dryer cycle may have failed after a temporary power outage. The door switch may have failed. The particular switch in the dryer cycle setting you are using may have failed (Other cycles may still work). The dryer thermostat(s) may have failed (prevents too hot/ over-heating). Follow the wires from the "heat selection switch" to find thermostat(s) in the hot air duct. They "turn ON" when too cool and "turn OFF" when hot enough. Mechanical switch contacts can "melt together" and stay always ON. Or switches can get pitted and stay "always OFF" after enough ON/OFF cycles. If pitted contacts happen, you can see this on them. Sometimes a finger nail file (I do not recommend a metal one) can shine them up again. Solid state (electronic) switches have to be tested with a meter or something else to see failure. Please don't do work on electrical or any other problems while the dryer is plugged in or still hot. Good luck. Your mileage may vary. ;-)

The timer is shot and needs a replacement

Hi, If the dryer heats but will not advance in either time or auto cycles, you need to change the timer.
You can test to see if the timer is getting voltage. Remove the top rear panel and locate the two wires going to the timer motor. There should be 120V when the dryer is running in time dry.
Please let me know if this helps or if I can assist you further.

Thanks
Vic

sounds like a bad cycle timer switch

On auto dry cycles, the cycle is controlled by moisture sensing bars located on either the rear or front bulkhead, ( visible inside dryer ) if the moisture sensor bars are shorted together (normally by wet clothing) the dryer will continue to run. If the dryer continues to run when the clothes are plenty dry, check and see if there is anything stuck between the sensor bars, (sometimes a metal sequin will cause this) or see if they are damaged. If not, you may have a problem with a timer contact, if the timer advances and stops moving at the same spot each time, I would suspect the timer. If this is an EvenHeat dryer, examine the control board located to the right of the timer in the control panel, for any burned components. Hope this helps.

http://www.youtube.com/watch?v=