i use this w/c

bought new extra parts yrs ago

yesterday i put all brand new electronics/motors on w/c--brand new
Z61 controller

would not work
light on joystick lite up
seemed to make real low sounding noise when joystick was pushed

all part were bought together yrs ago. came off same w/c.

any suggestion why it would not work?
i had to put old parts back on it.