TM 5-3805-281-24-1
Sub-System Diagnostics
WORK AND DRIVE LIGHT CIRCUIT OPERATIONAL INFORMATION
In order for the work and drive light circuits to function,
the key switch must be in the ACC or ON position.
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WORK AND DRIVE LIGHT CIRCUIT THEORY OF OPERATION
9015
grounded (terminal 19 remains grounded), energizing
When the key switch is in the ON or ACC position,
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work light relay K3 as well. With the work light relay
power is applied from work and drive light 10-amp fuse
energized, power is applied through relay terminals 3
F11 to terminals 1 and 3 of work and drive light relays
and 5 to work lights E1 and E6.
K3 and K4.
Relays K3 and K4 also apply power to pins 5 (work
When drive and work light switch S10 is moved to
light) and 4 (drive light) of optional connector X5 to
position 1, drive light relay K4 is energized by ground
provide for connection of additional lights.
applied to relay terminal 2 from terminal 19 of monitor
and controller display A5. With the drive light relay
When the key switch is in the ON or ACC position,
energized, power is applied through relay terminals 3
power is also applied from auxiliary power fuse F19
and 5 to drive light E2, and cab lights E7 and E8.
through terminal 3 of terminal strip X27, to rear light
switch S20. When switch S20 is On, power is applied
Power from the drive light relay is also applied to
to left and right rear lights E9 and E10. The ground
terminal 41 of monitor controller and display A5,
path for the rear lights is provided through X27
terminal 8 of engine mode and speed control unit A4,
terminal 5 to cab ground.
and the ILLUM terminal of radio A1 for panel
When the light switch is moved to position 2, terminal
20 of the monitor controller and display is also
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