4-42 4181383 First Edition
ELECTRICAL
4
Horn and Light Circuit—Theory of Operation
Power Circuit
Unswitched power is available from the battery positive
terminal to the starting motor battery terminal and then
from the starting motor battery terminal to 50 amp
thermal circuit breaker battery terminal.
Unswitched power is available from 50 amp thermal
circuit breaker battery terminal to key switch terminal A
and control module terminals J3-6 and J3-7.When the
key switch is turned to the run position, voltage is
provided from key switch terminal B to control module
switch power input terminal J3-2, powering up the control
module and energizing the two internal switched power
relays.
Voltage is also provided from key switch terminal B to
control module select 2 input terminal J4-2, activating the
input. With the select 2 input activated, the control
module selects the software program for this machine.
This allows the control module to be used in more than
one machine.
With the internal switched power relays energized,
switched power is available from switched power relay
terminal 87 to control module terminal J3-3. Switched
power is available from control module terminal J3-3 to
splice 90. From splice 90, switched power is available to
the horn switch.
With the internal switched power relays energized,
switched power is also available from switched power
relay terminal 87 to control module terminal J3-4.
Switched power is available from control module terminal
J3-4 to the light switch.
Horn Circuit
When the horn switch is placed in the on position, voltage
is provided to the horn, turning on the horn.
Light Circuit
When the light switch is in the on position, voltage is
provided to splice 390. Splice 390 provides voltage to
right and left work lights, turning on the lights.
Splice 390 provides voltage to engine temperature gauge
backlight terminal, lighting the gauge.
Splice 390 also provides voltage to fuel gauge backlight
terminal, lighting the gauge.
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