LUCAS ELECTRIC HORNS
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Model Numbers 69143A Low Note-69l44A High Note.
All horns are adjusted during manufacture to give their best per-
formance and will give a long period of service without any attention.
If one of the horns fails or becomes uncertain in its action it does not
follow that the horn has broken down. First ascertain that the trouble is
not due to some outside source, e.g., a discharged battery, or loose con-
nection or short circuit in the wiring of the horn; a short circuit in the
horn wiring will cause the fuse to blow. If both horns fail or become
uncertain in action, the trouble is probably due to a blown fuse, defective
relay or a discharged battery.
I
f the fuse has blown, examine the wiring
for the fault and replace the spare fuse provided. A defective relay must
be replaced. A discharged battery can be recharged by a long period of
day driving or from an external source of current.
LOCK NuT
AD-JuSlING fIIU"
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It is also possible that the performance of a horn may be upset by
the fixing bolt working loose, or b)' some component near the horn being
loose. If after carrying out the above examination' the trouble is not
rectified, the horn may need adjustment; but this should not be necessary
until the horns have been in service for a long period.
Adjustment does not alter the pitch of the note, but merely takes up
wear of moving parts. When adjusting the horns, short circuit the fuse,
otherwise it is liable to blow. Again if the horns do not sound on adjust-
ment, release the push instantly.
When making adjustments to a horn, always disconnect the supply.
lead to the other horn, taking care to ensure that it does not come into
contact with any part of the chassis and so cause a short circuit.
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