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10-38
CRANKING SYSTEM
ELECTRICAL SYSTEMS
(314)
"--
F £ L O
"'-.-
G~ERATOR
ACCELERATOR
VACUUMSWITCH
GENERATORRE:~L~
~L"'O"-J.r
I
TO
CHARGE INDICA
TOR
-----.----
.c:.
-
SOLENOID SWITCH CONTACTS
-
-SOL ENOIO
~
.......
_ ~
RELAY
SPRING HINGE
ARMATURE STOP
CHARGE INDICATOR
I
TO
BATTERY TERMINAL,
~~=::~,
i
.G
. .
ENERA::~;~~:NATOR
(:;;7-'
~
COIL
TO GASOLINE GAGE
•••• "
\
:
••• rNEUTRAL SAFETY SWITCH
~~~~~R
AND DIRECTION
:
?i.
:
. ,
}
1-/
;
DYNAFl..OW
ONLY·
....... L························ ....
. . . . . .
. . . . .
l
_
·
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:
~~I;A~~g~ITT~~~S~~:SION
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:
CARS ONLY
:
,--.----------------~---,
L
THIS CIRCUiT USED FOR
SYNCHROMESH TRANSMISSION CARS
SOLENOIO
~
PULL IN
COn..~
HOLD IN COIL
\
'\
PLUNGER~
':
\
CLUTCH
PINION COMPRESSION
SPRING
~
o
o
0
'
BATTERY
Figure 10-32 LCranking Systom Circuits
in" and "hold-in" coils of the solenoid, mag-
netizing the solenoid. The plunger is pulled into
the solenoid so that it shifts the drive pinion
into engagement with flywheel ring gear and
closes the solenoid switch
contacts.
The closing of the solenoid switch contacts
causes the motor to crank the engine and also
cuts out the "pull-in" coil of the solenoid, the
magnetic pull of the "hold-in" coil being suffi-
cient to hold the pinion in mesh after the
shifting has been performed. This reduces the
current consumed by the solenoid while the
cranking motor is operating.
Normally, as soon as the engine starts run-
ning and accelerator pedal is released, the mani-
fold vacuum causes the accelerator vacuum
switch to break contact and open the relay cir-
cuit. This causes the solenoid switch relay con-
tacts to open, which breaks the solenoid circuit.
A return spring on the shift lever stud allows
the solenoid switch to open and then disengages
the drive pinion from flywheel ring gear.
Under conditions where the throttle does not
return to idle position, or engine vacuum is not
sufficient to cause the accelerator vacuum switch
to break contact, the increased speed of the
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