1996 Ford Explorer XLT, 4door, 96K miles.

Recently my HVAC blower motor stopped running. I checked the fuses both in
the main box and in the power distribution box and they are both good. I
then disconnected the electrical supply to the blower motor to check the
voltage and get no voltage drop from the hot wire (pink/white) to ground.

My Haynes manual says the blower motor resistor and the fan speed switch are
on the ground side of the circuit, so these should not be the problem. It
could be the main heat controller switch (the one that switches from panel
vent to floor vent to defrost, etc.) but I don't think it is: my rear vent
blower still works and it requires this switch to be ON. Switching this
switch from off to any other setting allows the rear blower to come on, so I
know electricity is flowing through this switch.

Any ideas on where the circuit fault could be if its not the fuses and not
the switch? Anyone have a wiring diagram?

I'm stumped.

Thanks,
HR.