3.1. Clearance light, road and working
lights
The clearance and road light as well as the
number plate light and lighting devices are
switched on by means of the central light
switch “SA10”.
The key switch “SA10” is energized from
the fuse box (F1).
When setting the switch to the second
position (the first position corresponds to
the switched off state) the supplying
voltage is applied through the closed
contacts L-V of the switch to the relay and
after the relay – to the fuses (8) (15 A) and
(7) (7.5 А) (to the wire Г) and further to the
front and rear clearance lights of the left
and right sides as well as to the number
plate light and instrumentation backlight
lamps.
When setting the switch (SA10) to the third
position the clearance lights continue to be
energized, but already through the contacts
L-H; besides, due to closing the contacts I -
U, the supplying voltage is fed to the
steering-wheel mounted switch (SA7) (wire
О) for switching on the required beam of
the headlights.
a) Lower beam of the road headlights.
The arm of the steering-wheel-mounted
switch (SA7) is in the top fixed position –
the voltage is applied through its contacts
to the fuses (10) (7.5А) and (9) (7.5 А)
(wire С) and through the relay (K8) and
further – to the circuits of the lower beams
of the right (Ф) and left (Г) sides. The lower
beam relay (K8) unloads the contacts
(SA7) in the lower beam circuit.
b) Upper beam of the road headlights. The
arm of the steering-wheel-mounted switch
is in the bottom fixed position: the supplying
voltage is applied through the relay (K6)
(wire Р) to the fuse (6) (15 А) (wire Ф) and
further – to the upper beam circuit (wire 3).
The upper beam relay (K6) unloads the
contacts (SA7) in the upper beam circuit.
c) Signalling by switching on the upper
beam for short time.
The arm of the steering-wheel-mounted
switch is moved to the top unfixed position.
When it will be done, the upper beam of the
headlights is switched on irrespectively of
the position of the central light switch
(SA10). It is achieved due to breaking the
circuit of the switch (SA10) by the steering-
wheel-mounted switch (SA7) so that the
voltage is applied from the box (F1) through
the wires 3, Кч (SA6) to the switch (SA7)
(wires Кч) while bypassing the central light
switch (SA10).
The front Е3, Е4 and rear Е8, Е9 working
lights and cab lighting lamp Е7 are supplied
from the storage batteries GB1, GB2
through the fuse boxes F3 (25А) and F4
(15А) and switches S2, S3.
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