 http://www.youtube.com/watch?v=o41d6vCuEzo&fea
ture=related
Starting system
PURPOSE
The vehicles starting
system is designed to turn
or crank engine over.
Starting system
What are some of the
starting system
components.
6 basic components
 1) Battery
 2) Ignition switch
 3)Battery cables
 4)Starter motor assembly
 5)Starter safety switch
 6) Flywheel assembly
 Manual vehicle and some automatic
transmission have safety switches.
Starter
Average starter motor draws
about 250Amps or more.
This current flows through the
large cables that connect the
battery to the starter and ground.
Function

The starter circuit has 2 separate
circuits.
1) The control circuit
2) The starter circuit
The Control Circuit
 Connects battery power at the
ignition switch to the magnetic
switch which controls the high
current to the starter motor.
The Starter Circuit
Carriers the heavy current from
the battery to the starter motor
through a magnetic switch in a
solenoid.
Starter Solenoid
 Receives a large electric current from the car battery and
a small electric current from the ignition switch.
 When the ignition switch is turned on, a small electric
current is sent to the starter solenoid.
 This causes the starter solenoid to close a pair of heavy
contacts
Starter Solenoid
Starting Safety Switch
What is a Starting safety switch?
Why do we need a starting
safety switch?
Starting Safety Switch
 Also called a park neutral safety switch for
automatic transmissions.
 Prevents the starting system from operating
when the transmission is in gear. Switch in
series with circuit.
 Clutch start switch used on manual
transmission cars.
 Switch is mounted on clutch pedal.
PNP Switch
Clutch Safety Switch
Fly Wheel
Attached to the end of the
crankshaft.
Large diameter, makes it easy for
starter to engage and rotate engine
through gear reduction

FlyWheel
Starter failures
What are some of the
possible starting failures
that may occur.
Starting circuit failures
Starter solenoid.
Starter safety switches.
(PNP and clutch switch)
Battery problems
Starter motor.
Video
 http://www.youtube.com/watch?v=m1rVz3msbZ8
 http://www.youtube.com/watch?NR=1&v=5qaYm4s_k
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