I an trying to put a treadmill motor and controls onto my metal lathe
I have narrowed the wiring down to a 4 pin connecter that goes up to the dashboard
I'm hoping to get rid of the dashboard and just have an on/off switch and a speed control ....tho I'm not real sure how this is done

 

Best to show pictures of the circuit boards and wiring, any model numbers of the treadmill, then you will get better results.