In this position the two groups of alternator coils are connected in
parallel, and if the lights switch is in the 'OFF' position the full output of
the alternator goes into the battery. This will raise the voltage of a dis-
charged battery to a level sufficient to start the engine. In the EMG
position the charge rate is high—the engine should not be run in EMG too
long. The boost charge thus provided may be used to restore a discharged
battery. Switch over to IGN after ten minutes.
Rotor demagnetised. Although the WIPAC Rotor is robustly built and
holding a very high magnetic charge, it can become demagnetised if the
machine is run with battery connections reversed, or if the rectifier breaks
down. A demagnetised rotor should be returned to WIPAC for satisfac-
tory remagnetisation.
Testing. Testing of component parts can be carried out if the following
instruments are available:
0-12 d.c. Volt Meter.
0-15 a.c. Volt Meter.
1 ohm Resistor (capable of carrying 8 amps.).
10-0-10 d.c. Ammeter.
High grade and accurate moving coil instruments must be used. The
1 ohm, resistor must also be accurate, otherwise correct readings cannot
be obtained. Engine speed when testing should be in the region of 2,500
r.p.m. Tests should not be attempted at speeds below 2,000 r.p.m. A few
revs. above or below 2,500 will not affect the readings of an alternator in
good condition.
Charge rate test:
(1) First check the battery voltage which, if fully discharged, should
he substituted for one that is in good condition.
(2) Disconnect the brown negative lead from the double connector,
(3) Connect the d.c. ammeter in series with the battery wire and the
double connector.
(4) Run the engine at 3,000 r.p.m., the minimum permissible readings
are shown in the following table:—
Ignition switch
Ignition on
Ignition on
Ignition on
Emergency on
Lights switch
Off
Low
High
Off
Minimum charge
rate
1.0a
1.3a
1.0a
6.0a
The rate of engine speed and condition of the battery will affect the
charge rate recorded. The figures shown in the table in comparison with
the recorded figures indicate if the system is functioning correctly.
NOTE —If the charge rate is down with lights on HIGH check the main
bulb wattage.
Low or no charge rate test. Check the alternator output by:
(1) Disconnect the white, orange and light green wires from the four-
105
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