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3
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The adjustment screw should be tuned while
operating the horn until the ammeter indicates the
appropriate current consumption (see below). Turn
the screw clockwise to reduce the ammeter reading.
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NOTE :
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1
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Do not under any circumstances disturb the
centre core slotted screw and locknut.
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2
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It is essential, when adjusting on the vehicle,
that the wiring is not overloaded. This couid be
caused by attempting to sound the horn, while the
contacts are out of adjustment, and hence do not
open. If the horn supply is fused, the fuse should
beshorted out until adjustment has been completed.
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Contacts Setting Data
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High Note Horn
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Setting Current
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Setting Voltage
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12 volt
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3.0 - 3.5A
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13 volts
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Special Low Note Horn
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Setting Current
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Setting Voltage
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12 volt
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3.0 - 4.0A
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13 volts
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Horns should be checked for a good
clear note over the following voltage
range.
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12 volt
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11-12-15 volts
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SECTION J23
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HORN ADJUSTMENT (SINGLE STANDARD HORN)
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The horn is shown in Fig. J7 with the
adjustments crew arrowed. Adjustment will take up
wear on the moving parts which, if not attended to,
will cause roughness and a loss of performance.
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To adjust the horn, operate the horn button and
slowly turn the adjustment screw anti-clockwise
until the horn just fails to sound. Release the
horn button and turn the adjustment screw clockwise
one notch at a time until the original performance
is regained. The amount of adjustment may be
expected to vary between a quarter and
three-quarters of a turn. Note that if original
performance is not restored, the horn must receive
attention by the electrical manufacturer.
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SECTION J24
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ELECTROLYTIC CAPACITOR 2MC
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The capacitor is an electrolytic polarised type,
spring mounted to the rear of the battery. This
unit will be damaged beyond repair if it is
connected incorrectly. The small (3/16 in.)
terminal is the Positive ground (earth) terminal
with a red spot on the terminal rivet. The double
terminal is the Negative connection. The capacitor
should only be fittod with the terminals pointing
downwards. The battery may be removed altogether or
be completely discharged whilst the 2MC capacitor
permits normal starting and running. With the
capacitor in use, the lights may be used whilst the
engine is running though there is no parking
facility.
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Periodically the capacitor should be tested by
disconnecting the battery terminals - the negative
terminal should be insulated to prevent a possible
short circuit. Start and run the engine - full
lighting should be available. If the engine fails
to start and run, test as follows:
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(a)
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Disconnect capacitor.
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(b)
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Connect capacitor direct to 12 volt battery for
5 seconds (see polarity note).
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(c)
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Disconnect battery and let charged capacitor
stand for 5 minutes.
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(d)
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Connect D.C. voltmeter across the terminals (see
polarity note) and note the steady reading* which
should not be less than 9v for a serviceable unit.
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*Some meters may show immediate needie overswing
which should be ignored.
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