Vintage Synth Repair

I have a model-18 leslie, which is a normal 12" guitar speaker in a
box & a motor-driven styrofoam drum in front of it, venting out
through extra slots in the top & sides of an otherwise
ordinary-looking guitar cabinet design.
the motor has a speed switch, slow or fast (chorale or vibrato, in the
proper leslie parlance, I believe.
this is achieved by changing the connections to the windings in the
motor. could it be that in dismantling the assembly, you've missed a
connection somewhere?

duncan.