ELECTRICAL
4203781 First Edition 4-51
4
Work Lights Circuit—Theory of Operation
Unswitched Power Circuit
Unswitched power is available from the battery positive
terminal to the starter motor battery terminal and then
from the starter motor battery terminal to 50-amp circuit
breaker (F1) battery terminal. Unswitched power is
available through the 50-amp circuit breaker (F1) to
30-amp circuit breaker (F2) input terminal and from
circuit breaker (F2) input terminal to 10-amp circuit
breaker (F5).
Unswitched power is available from 30-amp circuit
breaker (F2) output terminal to accessory relay terminal
30.
Unswitched power is provided from 10-amp circuit
breaker (F5) to PTO switch terminal E and then from
terminal E to time delay relay +12V terminal.
Unswitched power is also available from the starter motor
battery terminal to 50-amp circuit breaker (F3). Circuit
breaker (F3) provides unswitched power to 30-amp
circuit breaker (F7) and to cab/canopy connector (J4)
terminal 8. Unswitched power is provided from circuit
breaker (F7) to the light switch and to cab/canopy
connector (J4) terminal 5.
Interlock Circuit
The interlock circuit provides 12 volts to the key switch.
The following must occur before the key switch is
provided with 12 volts:
• PTO switch in the off position
• Park brake switch in the on position
With the PTO switch in the off position and park brake
switch in the on position, voltage is provided from the
park brake switch to key switch terminal B.
Switched Power Circuit
When the key switch is turned to the run position, voltage
is provided from key switch terminal I to accessory relay
terminal 86, energizing the relay. With the relay
energized, switched power is provided from accessory
relay terminal 87 to 10-amp circuit breaker (F6).
Switched power is provided from 10-amp circuit breaker
(F6) to cab/canopy connector (J4) terminal 4.
Light Circuit
When the light switch is placed in the work position,
voltage is provided to the work lights, turning on the
lights. Voltage is also provided from the light switch to
cab/canopy connector (J4) terminal 7.
When the light switch is placed in the road position,
voltage is provided to the tail light, turning on the light.
Voltage is also provided from the light switch to
cab/canopy connector (J4) terminals 2 and 6.
To Next Page
Loading...
Need help?
General
