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 COIL IGNITION CURRENT.
With the engine and the ignition on, the ammeter will
remain at zero if the contact breaker is open and should
not read more than 4 amps discharge if the contacts are
closed. A reading much in excess of 4 amps discharge
through the ignition circuit indicates a fault in the
coil. With the engine running, the ammeter should read
not more than 1½ amps discharge.
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STARTER MOTOR CIRCUIT.
The starter motor circuit is entirely independent of the
switchboard, the positive terminal of the battery being
directly connected to one of the terminals of the starter
switch, the other terminal of which is directly connected
to the positive terminal of the starter motor.
The starter motor is series wound. The extension of its
armature spindle carries a pinion mounted on a screw
thread. The inertia of the pinion causes it to be drawn
into engagement with the teeth on the flywheel when the
starter motor begins to turn. When the engine starts, the
pinion is automatically thrown out of engagement by the
flywheel over-running it.
The starter-switch should always be decisively operated,
the plunger being quickly pressed right down and released
smartly immediately the engine starts. Careless operation
of the starter switch will result in burning of the
contacts which may make the switch itself jam. If this
happens the switch contacts must be filed clean and
smooth. Be sure to disconnect the cables from the battery
before doing this.
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