28
FORD MODEL A
ELECTRICAL SYSTEM
The electrical system includes the following equipment:
Storage Battery
Generator
Starting Motor
Distributor
Ignition
Coil
Spark Plugs
Ammeter
Horn
Lamps
Windshield Wiper
Engine
Ignition
The current for igniting the gas mixture in the cylinders is
provided by the storage battery. The ignition coil transforms
the low tension cw-rent to a high tension current of sufficient
\/oltage to jump between the points of the spark plugs. The
distributor breaker points interrupt the flow of low tension cur-
rent at regular intervals, while the distributor rotor distributes
the high tension current to each spark plug in proper firing
order.
Adjusting Breaker Contact Points
The gap between the breaker points is set at .018 to .022n.
The gap should occasio ally be checked to see that the points
are properly adjusted.
If the points are burnt or pitted they should be dressed down
with an oil stone.
Do not use a file.
To adjust the poin s proceed as follows:
Lift off distributor cap, rotor, and body.
Tum engine over slowly with starting crank until breaker
arm rests on one of the four high points of the cam with the
breaker points
fully opened.
Loosen lock screw and tum the contact screw until the gap
is between .O 18 and .
02 2 •. A standard thickncs gauge is used to
obtain this measurement.
Ignition Timing
As the spark must occur at the end of the compression
stroke the timing must be checked from that point. To find
the compression stroke and time the spark proceed as follows:
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