How do i tell if the window motor or the regulator is bad?

Maybe neither! .. Could be electrical... Watch for dome light dimming when window switch is activated .. Got to look very closely, should dim ever so slightly each time the window switch is operated .. IF light does indeed dim a tiny bit, replace the window motor AND regulator IF regulator has been damaged .. IF light does not dim at all, check electrical circuits to that window motor... Light dimming indicates power IS being sent to the window motor and the motor has failed! https://youtu.be/tSHxmoOfCLc