IMPORTANT: Never operate starting motor longer
than 30 seconds. Allow at least 2
minutes for cooling and battery
recovery before operating again.
Overheating caused by excessive
operation will seriously damage starting
TYPICAL STARTING CIRCUIT OPERATION
When wire from relay (A) is energized, current flows
through both pull-in winding (C) and hold-in winding (D) to
Current through windings engages solenoid plunger (E),
which closes main contacts (F). When main contacts
close, current through pull-in windings stops. Current
continues through hold-in winding, keeping solenoid
engaged and main contacts closed.
With main contacts closed, current flows from battery
cable (B) to starting motor at a very high rate. Four heavy
field windings (G) carry current to commutator brushes
B--Cable from Battery
Light shunt windings (J) are wrapped together with two of
the heavy field windings. Shunt windings are connected to
solenoid switch terminal and directly to ground. They
provide additional low speed torque to assist engine
rotation and prevent overspeeding of motor.
From field windings, current flows through armature
windings (I) to ground, making contact through
commutator brushes (H).
Strong magnetic fields are set up by current flow through
field windings and armature windings. Windings are
arranged so that magnetic fields constantly repel each
other, rotating armature.