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Relays
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Standard 6Ra continuously rated relays are used.
These should be so positioned that the cables
carrying the horn current are as short as possible.
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Technical Data
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Frequency of Notes
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438-495 Hz
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Ratio of Notes
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8 : 9
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Sound Intensity
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90 dB at 50 ft. (15.24 m)
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Cycle of Signal
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1-1.2 Hz
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Power Consumption
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60 watts
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Testing Procedure
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If the horns do not sound when the switch is
operated, check the voltage at the HC 3 control as
follows:
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1
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Connect a voltmeter, red lead to the cable
removed from the +ve terminal, black lead to the
cable removed from the - ve terminal. Operate
switch, voltmeter should read the nominal voltage
of the system.
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If the voltage is satisfactory at the control
unit proceed to check the individual horns and
relays separate from the control unit as follows:
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1
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Remove leads from one "R" terminal and the + ve
terminal on the control unit and join together.
Operate switch, the relay should be energised and
the associated horn should sound, if satisfactory.
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2
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Repeat above operation by joining together the
leads removed from the other "R" terminal and the +
ve terminal.
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3
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If both horns and relays operate normally, the
fault is in the HC 3 control unit. Replace unit.
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4
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If either horn does not sound, chack further by
earthing leads connocted to "C1" in the relay. If
horn now operates satistactorily, the fault is in
the relay. Replace unit.
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Other faults, i.e.: continuously sounding horns,
incorrect cycle of operation, etc., can be
attributed to a faulty control unit, which should
be replaced.
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Retuning the 9H Alternating Horns
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After horns have been in use for a long period
there will probably be a deterioration in
performance due to normal wear of the contact
breaker mechanism. If the rest of the system is in
order, proceed to reset the horn contacts as
follows:
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Contact Adjustment on Motorcycle
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1
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Connect a voltmeter across the terminals of the
horn, to check the voltage as the adjustment is
being made.
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2
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Connect an ammeter (range 0-25A) between
terminals "C1" and "C2" of the relay which supplies
the horn to be tuned.
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