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Electrical Service
GENERAL
The lighting and ignition systems are combined, using a six pole permanent magnet
excited A.C. generator, which charges the battery via a selenium rectifier. The remaining;
electrical units are fed from the battery in the normal manner.
The alternator unit has inherent regulating properties which combined with circuit
switching gives the correct charge rate under all conditions.
Emergency starting is provided by switching the six generator coils on to the battery.
which gives immediate voltage supply for the ignition coil.
position may also be used to provide high rate boost charge where the state of charge
of the battery is low. The use of the high charge rate should be limited to fifteen minutes.
Prolonged use of the high charge rate wilt cause evaporation of water from the electrolyte
(acid) with possible damage to the battery.
SIX POLE ALTERNATOR
The A.C. Generator used is called an "Alternator". The rotating member is a six
pole permanent magnet unit, which is of special design and magnet quality, and may,
therefore, be removed from the Stator Coil assembly without loss of magnetism.
The six coils of the Stator are connected in two sets of three in series. As three leads only
are brought out, one is common to both sets (this is WHITE). For test purposes, the:
same output is obtained between green and white as between orange and white,
By switching in a resistance unit we can obtain the following changes in the circuits to
provide varying outputs from the alternator.
The resistance unit is wound in the main loom of wires and is not visible as a separate
unit. Its location can be seen in the wiring diagram.
The switch positions are:
OFF/IGN
LOW/IGN
HIGH/IGN
OFF/EMG
LOW/EMG
HIGH/EMG
EMERGENCY STARTING
An EMERGENCY starting position is provided in the ignition switch for use if the
battery has become discharged.
direct to the ignition coil, allowing the engine to be started independently of the battery.
Once the engine is running, turn the ignition switch back to the normal running position.
RECTIFIER
The rectifier is a full-wave bridge connected unit,
The case must be earthed to the machine, and this
earth Is connected POSITIVE. The three bullet type
terminal connectors should be checked for tightness,
and also the centre fastening bolt.
the "earth" connection and so must meet clean faces
on the machine frame and rectifier case,
COIL I G N I T I O N
The coil, also the air filter body (when fitted) is housed in the accessory compartment on-
the left side of the machine.
screw, then take away the two bolts located below the cover.
The coil needs no attention beyond keeping the exterior clean, particularly between the
terminals, which must be securely tightened.
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Normal charge rate.
Normal charge rate.
Normal charge rate,
Boost charge rate.
Boost charge rate.
Normal charge.
Under these conditions, the alternator is connected
This bolt forms
Illustration 16—Rectifier
To remove the compartment cover unscrew the top cover
40
40
The emergency switch
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