ROYAL ENFIELD 350cc O.H.V. WORKSHOP MANUAL
Page 39
LIGHTING SWITCH. (Lucas Type U39).
101. Method of Making Connections.
All leads to the headlamp are taken direct to the
switch, which, together with the ammeter, is
incorporated in a small panel. The panel can be
removed when the three fixing screws are withdrawn.
The ends of all the cables are identified by means of
coloured sleevings. The colour scheme and the
diagram of connections are shown in the wiring
diagram (see Fig. 52). When making connections to
the switch, bare the end of the cable for about 3/8 in.,
twist the wire strands together and turn back about 1/8
in. so as to form a small ball. Remove the grub screw
from the appropriate terminal and insert the wire so
that the ball fits in the terminal post. Now replace and
tighten the grub screw; this will compress the ball to
make a good electrical connection.
ELECTRIC HORN.
(Lucas Type HF 1235 or Miller Type 21E).
102. General.
The horn is adjusted at the Works to give its best
performance and will give a long period of service
without any attention.
If a horn becomes uncertain in its action, giving
only a choking sound, or does not vibrate, it does not
follow that it has broken down. First ascertain that the
trouble is not due to some outside source, e.g., a
discharged battery or a loose connection or short
circuit in the wiring of the horn. It is also possible for
the performance of the horn to be upset by the fixing
bolt working loose. This can be ascertained by
removing the horn from its mounting, holding it
firmly in the hand and operating the push.
If the note is still unsatisfactory, the horn may
require adjustment.
103. Method of Adjusting.
The adjustment of a horn does not alter the
characteristics of the note, but takes up wear of
vibrating parts which if not corrected, results in loss of
power or roughness of tone.
If the horn is used repeatedly when badly out of
adjustment, due usually to unsuccessful attempts at
adjustment, the horn may become damaged, due to the
excessive current which it will take. When testing, do
not continue to operate the push if the horn does not
ELECTRIC HORN
Fig. 61
sound. If, when the push is operated, the horn does
not take any current (indicated by an ammeter
connected in series with the horn), it is possible that
the horn has been adjusted so that its contact breaker
is permanently open.
After adjusting, note the current consumption. A
horn may give a good note yet be out of adjustment
and taking an excessive current. When adjusting, do
not attempt to unscrew the nut securing the tone disc
or any other screws in the horn.
The adjustment is made by turning the adjustment
screw (Fig. 61) usually in a clockwise direction. The
underside of the screw is serrated and the screw must
not be turned for more than 2 or 3 notches before
retesting. If the adjustment screw is turned too far in a
clockwise direction, a point will occur at which the
armature pulls in but does not separate the contacts.
The current when the horn is adjusted to give its
best performance must not exceed 4 amperes.
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