Theory Of Operation And Sub Circuit Schematics; Power Circuit-Theory Of Operation - Textron JACOBSEN AR-5 Technical/Repair Manual

Theory of Operation and Sub
Circuit Schematics
Power Circuit—Theory of Operation
Unswitched 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 through the 50 amp thermal circuit
breaker to start and glow plug relays terminal 30.
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.
Switched Power Circuit
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 following components:
• Engine oil pressure light
• Horn switch
• Alternator terminal I
• Traction control switch
• Cruise control switch (optional)
• Engine temperature gauge B+ terminal
Switched power is also provided from the engine oil
pressure light to the hydraulic filter pressure light and
then from the hydraulic filter pressure light to the glow
plug light. From the glow plug light to the alternator light.
4181383 First Edition
Splice 90 also provides switched power to the following:
• Traction control switch
• Engine temperature gauge B+ terminal
• Cruise control switch (optional)
Switched power is also provided from engine
temperature gauge to the fuel gauge B+ terminal and
then from the fuel gauge B+ terminal to the hour meter.
With switched power provided to the gauges and hour
meter, the gauges start to operate and the hour meter
starts logging hours.
With the internal switched power relays energized,
switched power is available from switched power relay
terminal 87 to control module terminal J3-5. Switched
power is available from control module terminal J3-5 to
splice 100. From splice 100, switched power is available
to the following components:
• Neutral proximity
• Park brake proximity switch
• Hydraulic oil level switch
Switched power is also provided from hydraulic oil level
switch to the seat switch and then from the seat switch to
the mow switch. Switched power is provided from the
mow switch to the raise-lower 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. Twenty amp fuses F1 and F2
provide protection to the switched power circuit.
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