I have a diagnostic chart for the three speed and I'll see if I can find it.
There are also Youtube video's about them.
Here's the diag for the motor.
Testing the motor
The motor only has two speeds, high and low. The medium speed is a variable speed, which is configured by the switch varying the voltage to the motor.
"Low"
Connect the motor housing and the green wire to ground
Bridge the brown and red wires
Connect either the brown or red wires to 12v
Motor should turn slowly
"High"
Conect the motor housing and the green wire to ground
Connect the brown wire to 12v
Motor should turn fast
"Park"
Connect the motor housing and the red wire to ground
Bridge the brown and green wires
Connect the blue wire to 12v
Motor should turn backward, then stop in park position.