solenoid details

http://www.youtube.com/watch?v=o41d6vCuEzo&feature=related

Starting system

The vehicles starting system is designed to turn or crank engine over.

PURPOSE

What are some of the starting system components.

Starting system

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.

6 basic components

Average starter motor draws about 250Amps or more.

This current flows through the large cables that connect the battery to the starter and ground.

Starter

The starter circuit has 2 separate circuits.

1) The control circuit 2) The starter circuit

Function

Connects battery power at the ignition switch to the magnetic switch which controls the high current to the starter motor.

The Control Circuit

Carriers the heavy current from the battery to the starter motor through a magnetic switch in a solenoid.

The Starter Circuit

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

Starter Solenoid

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.

Starting Safety Switch

PNP Switch

Clutch Safety Switch

Attached to the end of the crankshaft.

Large diameter, makes it easy for starter to engage and rotate engine through gear reduction

Fly Wheel

FlyWheel

What are some of the possible starting failures that may occur.

Starter failures

Starter solenoid.Starter safety switches. (PNP and clutch switch)

Battery problemsStarter motor.

Starting circuit failures

http://www.youtube.com/watch?v=m1rVz3msbZ8

http://www.youtube.com/watch?NR=1&v=5qaYm4s_ksU

Video