Service Manual User guide

Electrical System
9.136
Model 644E-42/944E-42 Rev. 6/04
9.8.49 Roadlight Worklight Circuit & Troubleshooting (Option)
Schematic is drawn with the ignition switch in the RUN position.
WLG1WL2A
BOOM
WORKLIGHT
A
180
A
B
WL2A
WL3A
GROUND
BUSS BAR
125
WL3B
WL3A
WL3C
B
WLG
EG7
185
WLG1
WLG3
WLG2
WLG
215
WL1
WLG4
CAB
GRND
STUD
RLG6
A
B
WL2
WL3
WORKLIGHT
SWITCH
3
2
86
57
1 2
OFF
FRONT
ALLALL
OFF
FRONT
1
1
2
3
8
6
7 5
220
WL1A
WL1B
WL1C
WL1A
WL1C
WL1B
WLG4
WL2
WL3
WLG2
WORKLIGHT
FEMALE AND MALE
CONNECTORS
RIGHT
REAR
WORKLIGHT
NP
LEFT
REAR
WORKLIGHT
NP
F25 40
LIGHTS MAIN
(OPTION)
Y
F26 25
CONDENSER FAN
(OPTION)
Z
FJ21
28
FJ21
FJ20
26
FJ19
25
AA
27
AB
28
F27
OPEN
F28
OPEN
F1 40
OPEN CAB
VEHICLE MAIN
F2 15
IGNITION
CONTROL
BA1A
10
PB2A
2
PB2
IG1
PB1
To
Park Brake
Switch
BA3
BC1A
FJ15
20
FJ16
21
F20 10
BEACON/STROBE
(OPTION)
T
F21 7.5
BRAKE LIGHTS
(OPTION)
U
F22 20
HEADLIGHTS
(OPTION)
V
F23 15
TURN SIGNALS
(OPTION)
W
F24 20 or 30
WORK/ROADLIGHTS
OR WORKLIGHTS
(OPTION)
X
LP5
FJ18
23
24
FJ17
22
LP6
LP1
OPTION
HARNESS
LP6
LP5
LP4 LP2
LP3
To
Back-Up
Alarm Relay
789 131210 11 14
INSTRUMENT
PANEL
J7
BACK LIGHT
J8
GROUND
J9
POWER
J13
ACCUJMULATOR BRAKE PRESSURE
STABIL-TRAK SLOW PIVOT MODE
J12
TURN SIGNAL (OPTIONAL)
J10
ENGINE PRE-HEAT (OPTIONAL)
J11
HIGH BEAM (OPTIONAL)
J14
LIGHT
POWER
RELAY
87A 87
30
86
85
B
A
C
D
IGNITION
SWITCH
ACC
IGN
B+
OFF
ACC
IGN
ST
To
Ignition
Relay
To
Ignition
Relay
To Closed
Cab Main
(Option) Fuse
BC1A
B
A
1
C
A
B
POWER
MALE
CONNECTOR
12V BUSS BAR
A
B
C
BA1
BB1
BC1
POWER
FEMALE
CONNECTOR
STARTER
GND (-)
+
+
-
BATTERY 1
ENGINE
BLOCK
MU3311
Refer to
page 9.48
Refer to
pages 9.52
or 9.54