Timer on dryer was not advancing. Changed timer and it also is not advancing

This is a pretty straight forward dryer, first thing I would do is get out the meter and see if you have 120V across the terminals to the timer motor while unit is running. Does dryer have timed or auto dry settings? Will timer advance on timed dry? Even with the absence of a wiring diagram, you should be able to trace wiring back to the problem. Some timer motors will run off a dryness sensor board, others from a cycling thermostat. Some of these older dryers could have a start switch with stuck contacts and cause the timer to run right through the off position, just a heads up.