The starter pinion will engage with the ring gear before the
electric contacts in the solenoid close the circuit between the
battery and the starter motor. When the circuit between the
battery and the starter motor is complete, the pinion will turn
the engine flywheel. A clutch gives protection for the starter
motor so that the engine cannot turn the starter motor too fast.
When the start switch is released, the starter pinion will move
away from the ring gear.
The circuit breaker is a switch that opens the battery circuit if
the current in the electrical system goes higher than the rating
of the circuit breaker.
A heat activated metal disc with a contact point completes the
electric circuit through the circuit breaker. If the current in the
electrical system gets too high, it causes the metal disc to get
hot. This heat causes a distortion of metal disc which opens
the contacts and breaks the circuit. A circuit breaker that is
open can be reset after it cools. Push the reset button to close
the contacts and reset the circuit breaker.
Find and correct the problem that causes the circuit
breaker to open. This will help prevent damage to the
circuit components from too much current.
Circuit Breaker Schematic
(1) Reset button. (2) Disc in open position. (3) Contacts. (4)
Disc. (5) Battery circuit terminals.
Schematic Magnetic Pickup
The magnetic pickup is a single pole, permanent magnet
generator made of wire coils around a permanent magnet pole
piece. As the teeth of the flywheel ring gear go through the
magnetic lines of force around the pickup, an AC voltage is
made. The ratio between the frequency at this voltage and the
speed of the engine is directly proportional.
A magnetic switch (relay) is used for the starter solenoid
circuit. Its operation electrically, is the same as the solenoid.
Its function is to reduce the low current load on the start switch
and control low current to the starter solenoid.