Quote:
Originally Posted by stephen crowhurst
Thanks Chris, the wire from the starter winding that connects to the Start button was one of the wires dissed off when I got the chore horse.
I take it that the rheostat connects to earth through its body too the casing?
Cheers Stephen
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Correct. The shunt field winding connects to the end of the resistance track, and the wiper arm is earthed to the casing. The resistance then controls the current through the field winding and that determines the strength of the magnetic field and hence the generator output voltage.
The start button connects a series field winding between the positive battery terminal and the positive brushes on the armature. That turns the generator into an electric motor to crank the engine when the button is pressed. (If the battery can't supply enough current to turn the engine over you have to resort to the cord and pulley method.)
Best regards,
Chris.