I am sorry if I was confusing as to the voltage the control unit spits out.
The 10 - 12 volts is at the slowest rotational speed. If you turn the speed
knob clockwise, the voltage will approach 24 volts.
In any event, the 24 volts is supplied from a 26 VAC transformer THROUGH A
FUSE, to a bridge rectifier (a tab type), and then is variably regulated
(which makes up part of the speed control circuitry).
If you do not have any voltage at pins 4 & 5 when pressing a LEFT or RIGHT
button, open the box and check that fuse. It is mounted on the board that has
the motor reversing relay (PB2, PS-Unit). Perhaps it is open.
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