The wiring for the older Kenmore is simple. The light switch completes the connection to the light. If the foot pedal has failed or connection loose where the wire attaches from the foot-pedal the motor will not run.
Also if the brushes in the motor are worn or failing to contact the motor internally the motor will not run.
With light on and pedal partially depressed attempt to activate motor to determine if brush connection are faulty. If the motor reacts at all the brushes will likely need to be replaced.
No success borrow a foot pedal from a friend or sewing center to determine if the pedal control is faulty.
Hope this helps?
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