Small Engines (Lawn Mowers, etc.): wiring diagram and b&s engine, starter solenoid, screw terminal

Question
I have bought an old craftsman ride on mower.  I believe it has a b&s engine.  I have a craftsman mower model number of 917.252633.   I believe the model of the engine is b&s 220707-0148-01.  However that number does not come up in the b&s official web site I found the picture of my engine in the page that helps you locate the part number.  It is the vertical engine on the second page of engines in the lower right hand corner.  The cover over the flywheel and magneto is one piece.  On one side of the magneto is the starter.  On the other side of the magneto is the air filter and carb.  There are only a few wires coming off of the engine.  The first is coming from under the flywheel just clockwise from the top of the starter if you are looking down on the mower.  The best I can tell it is a red wire with a quick disconnect plug.  The wire is cut 3 inches from that plug.  This wire goes to a series of coils or magnets on the top of the motor under the flywheel.  They appear to make contact to the inside of the flywheel (similar to brake drums and brake shoes on a vehicle).  Another wire is a very thin black wire that comes from under the magneto and goes to a screw terminal on the linkage where the throttle cable meets the motor.  I have already replaced the battery and starter solenoid.  I also replaced the magneto and spark plug.  The non-insulated wire for the magneto is grounded to the magneto mounting screw.  The black insulated wire from the magneto goes under the flywheel and screws onto the point under the cover under the flywheel.  This is also there the wire to the condenser and the thin black wire (going to the linkage where the throttle cable meets the motor) is connected.  I have the enable wire coming off of the starter solenoid going to a push button.  I am assuming that the two wires (red from under the flywheel by starter, and black on the linkage for the throttle cable) are the two wires needing + and - to complete the circuit.  However the motor just cranks without turning over.  Can you tell what is not correct or what I need to hook up?  Do you have any input on getting this motor running?  Thank you for you time.

Joe Amato
Lynchburg, Virginia

Answer
The wire next to the throttle linkage is the engine shut-off wire.  It is connected to the condnesor and the other end to the key switch ground.

Those coils under the flywheel are for the alternator.  The permanent mounted magnets in the flywheel rotate which induces voltage/current in the coils which charge the battery.

As for the points, there is no + voltage needed.  The condencer wires are one from the coil and the other is the engine shut-off wire.  

Are your points under the flywheel?

Let me know.
Eric