Started by taking the back panel of the dryer off and checking continuity for multiple parts including thermal fuse. All parts had continuity. Then took front panel off and checked continuity on gas valve coils, igniter , etc. All had continuity. Next Released the belt and took out the drum. Next put gas back on and plugged in dryer and ran dryer to see if igniter would glow. The igniter would glow and ignite the gas for 10 seconds and turn off. If I moved timer at the same time the igniter would glow again and ignite the gas and shut down in 10 seconds. The motor never stopped and continued to operate. After this I took off top back panel where timer is housed and checked continuity on contacts A & C on the lower left wire connection. These failed on the multimeter. Timer was ordered and replaced and all worked.