STARTING SYSTEM. STARTING SYSTEM. STARTING SYSTEM. Battery provides the current to turn the starter motor. Fuse protects the circuit. Ignition switch closes the circuit. Relay uses small amount of current to control large amount. .
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Battery provides the current to turn
the starter motor.
Fuse protects the circuit.
Ignition switch closes the circuit.
Relay uses small amount of current to control large amount.
Neutral safety switch opens the circuit until the vehicle is in neutral
(manual transmission), or park (Automatic). (Can be adjusted)
Solenoid does the same thing as relay, but performs
mechanical operation. It is an electromagnetic switch.
Starter motor engages pinion gear to ring gear (mounted on flywheel,
Or torque converter).
Inside the starter motor.
COMMUTATOR sliding electrical connection between the motor
windings and the brushes.
BRUSHES ride on top of the commutator to carry battery current
to spinning windings.
Starter Armature consists of the armature shaft, armature core,
commutator and armature windings.
Field winding is a stationary insulated wire wrapped in a circular
shape. It creates a strong magnetic field around the motor armature.
Pinion Gear is attached to the starter drive and when starting the
vehicle the pinion gear engages with flywheel or
ring gear. It is moved by the YOKE.
Overrunning Clutch Starter
Gear Reduction Starter
DC electric motors have three common types of internal connections:
Series-wound motors develop maximum torque at initial start-up.
Torque decreases as motor speed increases.
Shunt-wound motors have less starting torque but more constant
torque at varying speeds.
Compound-wound motors have both series and shunt windings.
They have good starting power with fairly consistent operating speeds.
Neutral safety switchprevents the vehicle from starting while in
gear. (can be adjusted)
Clutch Safety Switch prevents the vehicle from starting, unless the
clutch pedal is pressed. (adjustable)
When replacing a starter motor, make sure
the spacer shims are of correct thickness
If these shims are left out, the pinion
gear may not mesh with the
flywheel gear properly, and might
cause damage to the ring-gear.
No crank with no headlights
Head lights go out when cranking
Lights stay bright but, no crank
Current Draw Testmost of the starters draw over 200 Amps.
4 Cylinder – 150/200 amps
6 Cylinder – 175/250 amps
8 Cylinder – 225/300 amps
Voltage Drop Test checks for high resistance across a cable/connection