Solenoid

ELECTRICAL SYSTEM

SYSTEMS OPERATION

The starting motor has a solenoid. When the start

pushes core (6) from the magnetic center of coil (1). Low

current will energize coil (1) and make a magnetic field.

switch is activated electricity from the electrical system

will cause the solenoid to move the starter pinion to

The magnetic field pulls core (6) to the center of coil (1)

and the contacts close.

engage with the ring gear on the flywheel of the engine.

The starter pinion will engage with the ring gear before

the electric contacts in the solenoid close the circuit

Circuit Breaker

between the battery and the starting motor. When the

start switch is released the starter pinion will move away

The circuit breaker is a safety switch that opens the

from the ring gear of the flywheel.

battery circuit if the current in the electrical system goes

higher than the rating of the circuit breaker.

Solenoid

A heat activated metal disc with a contact point

completes the electric circuit through the circuit breaker.

A solenoid is a magnetic switch that uses low current

If the current in the electrical system gets too high it

to close a high current circuit. The solenoid has an

causes the metal disc to get hot. This heat causes a

electromagnet with a core (6) which moves.

distortion of the 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.

SCHEMATIC OF A SOLENOID

1. Coil. 2. Switch terminal. 3. Battery terminal. 4.

Contacts . 5. Springs. 6. Core. 7. Component

CIRCUIT BREAKER SCHEMATIC

terminal.

1. Reset button. 2. Disc in operation. 3. Contacts.

4. Disc. 5. Battery circuit terminals.

There are contacts (4) on the end of core (6). The

contacts are held in the open position by spring (6) that