start at the wall plug
Look at the wiring at the plug, then the on/off switch then to the motor. The wire size for that 1 1/2 HP motor should be no less than 12 GA which will carry 20 AMPs. If all seems well, then it's on to the next step.
If your belt is not slipping, you should be able to stall the motor by "force feeding" with a heavy cut. It should stall, and then trip the breaker which should be 20 AMPs. If it just stalls and has no power, then it's time for a trip to the electrical motor repair shop. You can look into replacing the "run" capacitor, but when you open the wiring box, all sorts of things can go wrong,.... go wrong .... go wrong....
Broken wires or loose wires that "have no home" etc... then you'll be coming back here with questions about where do these wires go? :frown2:
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)