D20D & D250D AGRICULTURAL TRUCKS ELECTRICAL SYSTEM

Component Locations
Components in the operator Station Tractor Mounted Components
IDENT Component
Schematic
Location
IDENT Component
Schematic
Location
1 ALARM - LOW BRAKE OIL PRESSURE F-3 66 AUX. START RECEPTACLE A-6
2 ALARM - PARK BRAKE WARNING F-2 67 BATTERI ES A-5
3 BREAKER - AIR CONDITIONER D-4 68 HORN - HIGH TONE B-1
4 BREAKER - ALTERNATOR D-4 69 HORN - LOW TONE B-1
5 BREAKER - HEADLAMP D-4 70 LAMP - CAB B-7
6 BREAKER - KEY E-4 71 LAMP - HIGH BEAM HEAD - RIGHT B-1
7 BREAKER - RUNNING LAMPS E-4 72 LAMP - HIGH BEAM HEAD - LEFT C-1
8 DIODE BLOCK F-2 73 LAMP - LOW BEAM HEAD - RIGHT B-1
9 FLASHER D-2 74 LAMP - LOW BEAM HEAD - LEFT C-1
10 FUSE - BACK UP ALARM E-5 75 LAMP - TURN/PARK - RIGHT - FRONT B-1
11 FUSE - BODY HOIST CONTROL E-5 76 LAMP - TURN/PARK LEFT - FRONT C-1
12 FUSE - CAB LAMP D-5 77 MOTOR - FRONT WASHER E-12
13 FUSE - DIFF. LOCK D-5 78 SOLENOID - BODY RAISE E-10
14 FUSE - HORN E-5 79 SOLENOID - BODY LOWER D-10
15 FUSE - GAUGES D-5 80 SOLENOID - PARK BRAKE C-2
16 FUSE - INDICATORS D-5 81 SOLENOID - RETARDER B-4
17 FUSE - PARK BRAKE D-5 82 SOLE NIOD - START AID C-2
18 FUSE - RETARDER E-5 83 SWITCH - BRAKE OIL PRESSURE A-9
19 FUSE - START AID D-5 84 SWITCH - DISCONNECT A-5
20 FUSE - WASH/WIPE - FRONT E-5 85 SWITCH - FUEL LEVEL A-2
21 GAUGE - CONVERTER TEMPERATURE E-6 86 SWITCH - REFRIGERANT B-2
22 INDICATOR - ALTERNATOR CHARGE F-4 87 SWITCH - STOP LAMP D-3
23 INDICATOR - BRAKE OIL PRESSURE F-5 88 SWITCH - STEERING PRESSURE B-3
24 INDICATOR - CONVERTER LOCK F-6
Engine and Transmission Mounted Components
25 INDICATOR - COOLANT TEMPERATURE F-5 IDENT Component
Schematic
Location
26 INDICATOR - DIFF. LOCK F-5 89 ALTERNATOR A-2
27 INDICATOR - ENGINE OIL PRESSURE F-5 90 MOTOR - STARTER A-6
28 INDICATOR - HIGH BEAM F-5 91 PICK-UP - SPEEDOMETER E-11
29 INDICATOR - LEFT TURN F-6 92 PICK-UP - TACHOMETER A-3
30 INDICATOR - LOW FUEL F-6 93 SENDER - CONVERTER TEMP. C-11
31 INDICATOR - PARK BRAKE F-6 94 SOLENOID - AIR CONDTNR CLUTCH B-3
32 INDICATOR - RETARDER F-4 95 SOLENOID - DIFF. LOCK B-7
33 INDICATOR - RIGHT TURN F-4 96 SOLENOID - ENGINE SHUTDOWN A-2
34 INDICATOR - STEERING PRESSURE F-6 97 SWITCH - CONVERTER TEMPERATURE F-11
35 INDICATOR - TRANSMISSION OIL TEMP F-4 98 SWITCH - COOLANT TEMPERATURE A-4
36 LAMP - DOME C-7 99
SWITCH - COOLANT TEMPERATURE
(ETHER INHIBIT)
A-4
37 METER - SPEEDO. E-4 100 SWITCH - ENGINE OIL PRESSURE A-3
38 METER - SERVICE HOUR E-5 101 SWITCH - LOCK UP PRESSURE B-5
39 METER - TACHO E-5 102 SWITCH - RETARDER INHIBIT B-5
40 MOTOR - BLOWER C-4
Trailer Mounted Components
41 MOTOR - FRONT WIPER C-7 IDENT Component
Schematic
Location
42 RELAY - ALTERNATOR CHARGE F-1 103 ALARM-BACKUP A-12
43 RELAY - MAIN POWER D-4 104 LAMPS-BACKUP A-12
44 RELAY - PARK BRAKE E-7 105 LAMP-STOP/TAIL/TURN-RIGHT A-12
45 RELAY - START D-8 106 LAMP - STOP/TAIL/TURN - LEFT B-12
46 RESISTOR - AIR CONDTNR/HEATER D-5
47 SWITCH - BACK-UP ALARM C-9
48 SWITCH - BLOWER C-5
49 SWITCH - BODY HOIST CONTROL D-8
50 SWITCH - BODY HOIST D-8
51 SWITCH - CAB LAMP F-7
52 SWITCH - DIFF. LOCK B-8
53 SWITCH - DIMMER D-2
54 SWITCH - DOME LAMP C-7
55 SWITCH - FRONT WIPER E-8
56 SWITCH - HORN F-8
57 SWITCH - KEY START E-2
58 SWITCH - NEUTRAL START C-9
59 SWITCH - PARK BRAKE - PRESSURE C-2
60 SWITCH - PARK BRAKE E-8
61 SWITCH - RETARDER CONTROL F-10
62 SWITCH - RUNNING LAMP F-8
63 SWITCH - START AID E-3
64 SWITCH - TURN SIGNAL E-2
65 THERMOSTAT C-4
Wire Description
Wire
Number
Wire
Description
Wire
Number
Wire
Color
Description
Power Circuits
Monitoring Circuits
101 RD BATTERY 400 GN SERVICE HOUR METER (-)
102 BU HEAD LAMP BREAKER TO SW. 403 GN ALTERNATOR (R) TERMINAL
103 YL DOME/DASH/PARK/TAIL LAMP 405 GY ENGINE OIL PRESS.
105 BR BREAKER TO KEY SWITCH 406 PU ENGINE COOLANT TEMP. INDICATOR
107 WH ENGINE SHUTDOWN CONTROL 407 PK TRANSMISSION TEMP. INDICATOR
109 OR ALTERNATOR OUTPUT (+) TERM. 419 YL PARK BRAKE INDICATOR
112 PU MAIN POWER RELAY OUTPUT 432 PK BRAKE OIL PRESSURE INDICATOR
118 GY FRONT WIPER FUSE TO SW. 443 YL CONVERTER TEMP. GAUGE
121 YL FUSE TO BACK UP ALARM SW. 449 BU SPEEDO. PICK-UP
123 WH FUSE TO GAUGES 450 YL TACHOMETER PICK-UP
124 GN HEATER/AIR CONDITIONER SW. 454 GN RETARDER INDICATOR
130 GN
FUSE TO INDICATORS, LOW BRAKE OIL
PRESSURE HORN AND WARNING
HORN (FORWARD)
469 GN FUEL LEVEL SWITCH
158 BR DIFF. LOCK FUSE TO SW. 477 YL SPEEDO. PICK-UP
160 PU BODY HOIST FUSE TO SOLENOIDS 484 YL STEERING PRESSURE INDICATOR
165 YL FUSE TO START AID SW. 490 GN TORQUE CON.LOCK UP INDICATOR
173 YL
FUSE TO CAB LAMP AND STOP LAMP
SWITCHES
B404 YL ALTERNATOR INDICATOR
190 PK FUSE TO PARK BRAKE SW.
Accessory Circuits
199 OR FUSE TO RETARDER SW. 500 BR WIPER - FRONT (PARK)
Ground Circuits
501 GN WIPER - FRONT (LOW)
200 BK MAIN CHASSIS 502 OR WIPER - FRONT (HIGH)
200 BK BODY HOIST CONTROL GROUND 506 PU WASHER - FRONT
Basic Machine Circuits 513 OR
AIR CONDITIONER COMPRESSOR TO
REFRIGERANT SW.
301 BU STARTER SOL. TO RESISTOR 515 GY BLOWER MOTOR (HIGH)
304 WH STARTER RELAY TO NO.1 OUTPUT 516 GN BLOWER MOTOR (MEDIUM)
306 GN START RELAY TO NEUTRAL START SW. 517 BU BLOWER MOTOR (LOW)
307 OR KEY START SW. TO NEUTRAL START SW. 521 YL AIR CONDITIONER SW. TO REFRIGERANT SW.
308 YL MAIN POWER RELAY COIL 522 WH
AIR CONDITIONER COMPRESSOR TO
THERMOSTAT SW.
310 PU START AID SW. TO START AID SOL. 537 GN TURN SIGNAL SW TO FLASHER
311 WH START AID SOL. TO TEMP SW. 539 BU TURN SIGNAL INDICATOR - RIGHT
321 BR BACK UP ALARM/LAMP 540 WH TURN SIGNAL INDICATOR - LEFT
322 GY SW. TO WARNING HORN (FORWARD) 572 PU RETARDER INHIBIT SW. TO SOL.
324 BU DIFF. LOCK SW. TO INDICATOR/SOL.
Lighting Circuits
326 PU KEY SWITCH "C" TERMINAL 602 WH DOME LAMP
370 BU
DIODE BLOCK TO LOW BRAKE OIL PRESSURE
HORN
604 OR STOP LAMP SW. TO STOP LAMP
371 OR
DIODE BLOCK TO NEUTRAL START SW. AND
PARK BRAKE WARNING HORN
605 YL TURN LAMP - LEFT
606 GY TURN LAMP - RIGHT
610 OR DIMMER SW. TO RUNNING LAMP SW.
611 PU HEAD LAMP HIGH INDICATOR
614 PU PARK/TAIL/GAUGE LAMP
619 GN HEAD LAMP - LOW
624 YL CAB LAMP
Control Circuits
706 BR
TRANSMISSION RETARDER SW. TO
RETARDER SOL.
A958 WH PARK BRAKE SOL.
B761 YL BODY RAISE SOL.
B762 GN BODY LOWER SOL.
T
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
Normally open switch that is closed due to an applied condition, and will open again with a
specific decrease in that condition.
Normally closed switch that will open with an increase of a specific condition.
Normally closed switch that is open due to an applied condition, and will close again
with a specific decrease in that condition.
The circle indicates that the component has screw terminals and a wire can be disconnected
from it.
No circle indicates that the wire cannot be disconnected from the component.
This indicates that the component has a wire connected to it that is connected to ground.
This indicates that the component does not have a wire connected to ground. It is grounded
by being fastened to the machine.
Electrical Schematic Symbols And Definitions
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
A AA
2
A AA
1
2
325-PK-14
C
A
325-PK-14
200-BK-14
T
FUSE - A component in an electrical circuit that will open the circuit if too much current flows
through it.
REED SWITCH - A switch whose contacts are controlled by a magnet. A magnet closes the
contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
SENDER - A component that is used with a temperature or pressure gauge. The sender
measures the temperature or pressure. Its resistance changes to give an indication to the
gauge of the temperature or pressure.
RELAY (Magnetic Switch) - A relay is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it. The electromagnet
can open or close the switch part of the relay.
CIRCUIT BREAKER (C/B) - A component in an electrical circuit that will open the circuit if too
much current flows through it. This does not destroy the circuit breaker and it can be reset to
become part of the circuit again.
SOLENOID - A solenoid is an electrical component that is activated by electricity. It has a coil
that makes an electromagnet when current flows through it. The electromagnet can open or
close a valve or move a piece of metal that can do work.
Harness And Wire Electrical Schematic Symbols
Socket
Pin
Pin or Socket
Number
Wire, Cable, or Harness
Assembly Identification
Single Wire
Connector
Circuit Number
Identification
Wire
Gauge
Wire
Color
Plug
Receptacle
9X-1123
Component
Part Number
Electrical Schematic Symbols And Definitions
1
1
1
2
2
Typical representation of a
Sure-Seal connector. The
plugand receptacle contain
both pins and sockets.
Typical representation of a
Deutsch connector. The
plug contains all sockets
and the receptacle contains
all pins.
MAGNETIC LATCH SOLENOID - A magnetic latch solenoid is an electrical component that is
activated by electricity and held latch by a permanent magnet. It has two coils (latch and unlatch)
that make electromagnet when current flows through them. It also has an internal switch that places
the latch coil circuit open at the time the coil latches.
SENR8232
March 1993
D20D & D250D
Electrical System
6NG1-UP
9MG1-UP
Articulated Trucks
©
1993 Caterpillar
All Rights Reserved
Printed in U.S.A.
3
4
5
57
62
6
61
64
63
60
8
9
10
11
12
14
15
13
16
1
11
12
2
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
37
35
33
34
38
7
39
43
45
47
48
49
50
51
52
53
58
55
56
Operators Station
59
69
68
69
68
67
66
65
78
79
81
83
88
87
86
82
84
70
79
78
74
72
77
80
86
82
85
1
03
1
05
1
04
1
04
1
06
36
36
72
76
74
77
70
75
71
73
40
41
41
46
65
40
46
54
54
Engine and Transmission - Right Side
Engine and Transmission - Left Side
89
94
97
93
95
91
92
96
90
99
98
100
102
101
T
T
12
2
4
3
1
3
4
5
2
1
2
3
4
1
1
3
3
2
4
8
7
2
1
3
6
5
1
2
3
1
5
3
2
4
2
1
6
5
4
3
2
6
1
1
2
2
1
2
3
3
2
1
1
1
5
1
4
3
2
2
3
4
5
1
2
3
2
1
4
2
1
1
2
10
9
2
1
2
1
1
2
1
4
3
2
8
3
6
4
4
4
7
8
5
2
6
3
1
9
4
1
2
1
2
2
1
1
6
2
1
1
2
2
1
2
3
1
6
5
4
3
2
1
2
3
2
1
1
3
2
1
3
4
5
7
1
2
3
3
2
1
2
3
9
4
5
2
8
6
3
5
1
4
3
4
5
2
5
2
1
2
1
1
11 10
12 11 10
9 8 7
9 8 7
6 5 4 3 2 1
6
5
4
3
2
1
F
E
D
C
B
A
F
E
D
C
B
A
1
M
B
E
F
D
L
G
C
W
S
4
2
J
H
R
T
P
K
N
A
3
V
627-YL
KK
200-BK-14
484-YL
L48L48
L48
L48
L48
L48
L48
L48
L48
L49
L49
L49
L3
L3
NOTE G
443-YL
200-BK
3
5 4
1
200-BK
507-WH
109-OR-10
SEE AREA G
BK
U
U
U
158-BR
F
200-BK-14
321-BR
200-BK
419-YL
F
F
B-5
A-8
A-8
A-8
AREA G
TILT CAB CONVERSION HARNESSES
A-7
A-7
BK
304-WH-10
(LOC D-7)
TT AC
C AS S
(LOC C-4)
109-OR-6
101-RD-6
(LOC D-5)
RR CA
U
A Q
611-PU-14
A958-WH
614-PU
706-BR
490-GN
326-PU
605-YL
400-GN
403-GN
310-PU
606-GY
469-GN
450-YL
477-YL
449-BU
540-WH
539-BU
V
405-GY
406-PU
407-PK
322-GY
(LOC E-1)
Q B
443-YL
3
A
N
K
P
T
R
H
J
2
4
S
W
C
G
L
D
F
E
B
M
1
(LOC B-6)
AP
D775-OR
453-PK
618-YL
617-BR
B762-GN
B761-YL
200-BK-14
324-BU
321-BR
419-YL
521-YL-14
522-WH-14
619-GN-14
604-OR
U
LAMP
2U-4806
G
E
F
J
H
L
K
W
V
U
T
S
R
P
N
M
1
B
A
D
3
4
2
C
PD
C
2
4
3
D
A
B
1
M
N
P
R
S
T
U
V
W
K
L
H
J
F
E
G
A
200-BK
200-BK
322-GY
322-GY
322-GY
130-GN
SEE AREA G
L31
443-YL
109-OR-10
SEE AREA G
453-PK
200-BK-14
490-GN
130-GN
370-BU
B
B
B
B
30
484-YL
B
310-PU
SEE AREA G
443-YL
TO AUX
STOP LAMPS SW
160-PU
D
610-OR-14
+-
EMS
TEST
SWITCH
NOTE F
FAULT
LAMP
NOTE F
L28
L51 L51
L51
L51
L51
L51
L51 L51
L50
L50
L50
L49
L49
CIRCUIT GROUPING
DESIGNATION
#L
ATCH WIRE, CABLE,
COMPONENT
CIRCUIT NOT CONNECTED
CIRCUIT CONNECTED
BLUE
GREEN
BU
GN
RD
WH
OR
YL
PK
BK
BLADE, SPADE, RING,
OR SCREW TERMINAL
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
ELECTRICAL CONNECTION
TO VEHICLE STRUCTURE
CONNECTOR
SYMBOL DESCRIPTION
BROWN
PURPLE
GRAY
BLACK
COLORABBREV
PINK
YELLOW
ORANGE
D775-OR
D775-OR
L6
449-BU
477-YL
507-WH
506-PU
507-WH
453-PK
200-BK
L49
L49
L49
L49
L39
L39
B762-GN
B761-YL
B
505-BU
504-YL
503-BR
WHITE
617-BR
617-BR
618-YL
617-BR
618-YL
505-BU
618-YL
617-BR
B
617-BR
B
B
NOTE G
A
200-BK
504-YL
618-YL
503-BR
110-GN
ATCH
9
9
A-1/C-1
C-1
7
627-YL
627-YL
7
8
NOTE G: FOR USE ON VEHICLES WITH TUV OPTION ONLY
614-PU
614-PU
A
617-BR
L38
618-YL
617-BR
618-YL
617-BR
604-OR604-OR
173-YL
173-YL
D
A
D
00
200-BK
7U-6401FF
ATCH
A
627-YL
L39
EE
200-BK
3
200-BK
200-BK
ATCH
ATCH
ATCH
00
00
00
00
01
105-9677
103-5907
103-5908
RED
BR
1
2
FF
104-4368
103-5905
ATCH01103-5906
D
D
U
NOTE D
A-11
B-11
002U-9023
002U-9024
M
T
S
L
M
L
200-BK
200-BK
L39
FF
H
E
E
E
E
200-BK
321-BR
RH STOP/TAIL/TURN
LAMP
2U-9213
BULB
7H-2976
3H-2691
605-YL
604-OR
614-PU
604-OR
614-PU
200-BK
321-BR
321-BR
BACK UP
ALARM
3T-1815
200-BK
200-BK
200-BK
200-BK-14
321-BR
604-OR
604-OR
606-GY
614-PU614-PU
200-BK
200-BK
200-BK
E
PU
GY
E
CAB TO
GROUND
STRAP
N
110-GN
614-PU
614-PU
419-YL
371-OR
D775-OR
112-PU
1
M
B
E
F
D
L
G
C
W
S
4
2
J
H
R
T
P
K
N
A
3
443-YL
L3
BR
L10
L6
L17
L17
BU
RD
L48
L48
L48
L48
L47
L47
L47
L47
L46
L46
L46
L46
L46
L45
L45
L45L45
L45
L44
L44
L44
L44
L44
L40
L40
L40
L40
L40L40
200-BK
200-BK
L40
STEERING
PRESSURE SW
8T-8640
200-BK
200-BK
200-BK
200-BK
A
484-YL
BK
BK
RD-18
200-BK
200-BK
NOTE G
419-YL
540-WH
200-BK
B
B
A
A
B
507-WH
C
C-7
STEERING
PRESSURE
INDICATOR
7N-9967
BASE
2G-0151
B
B
110-GN
432-PK
370-BU
L43
371-OR
L43
L43
C
B
110-GN
110-GN
C
112-PU
371-OR
AUX
SOUNDER
2U-8863
130-GN
10A
L43
130-GN
419-YL
L43
L42
L42
L42
L42
L42
L42 L42
RD
RD
374-PK
374-PK
PARK BRAKE SW
102-9371
307-OR
PARK BRAKE
RELAY
3T-2170
B
B
B
374-PK
374-PK
B765-BR
B765-BR
B765-BR
B765-BR
B765-BR
B765-BR 190-PK
B
B
B
B
ALARM
9G-9813
DIODE BLOCK
2U-4539
B
L4
L1
L1
L2
L2
L6
L7
L5
L7
L7
L12L12
L14L14
L13
L18
L18
L5
L5
L7
L18
L8
PK
L9
L9
L9
L18
L1
L2
L6
L10
L17
L15
L15
L31
L17
L17
L7
L16
L6
L13
L8
L18
L19
L19
L13
L14
L20
L9
L19
L19
L16
L25
L26
L24
L16
L31
L24
L24
L13
L20
L23
L23
L21
L1
L1
L22
L10
109-OR-6
L22
L13
L11
L11
L22
L28
L28
L21
L21
L3
L3
L3
L26
L20
L20
L16
L16
L15
L15
L30
L31
L31
L25
L25
L24
L24
L24
L24
87A
87
86
85
L32
L15
L13
L20
L30
L30
L27
L27
GN
GN
L21
L29
L29
L27
B
B
BB
B
BB
B
BBBBB
B
B
B
B
B
B
B
B
B
B
123-WH
B
B
B
X
X
X
X
X
X
X
C
C
X
L28
C
540-WH
322-GY
407-PK
7U-5418
7U-8983
7U-9502
7U-8984
00
00
00
01
007U-5670
2U-8924
7U-7950
01
00
009Y-1267
A-5
A-5
A-5
A-6
A-6
D-4
D-4
A-2
C-5
B-12
L29
C-7
B-12
B-11
C-5
D-8
F-2
E-1
00
01
00
L27
00
00
02
01
01
02
2U-8948
9X-4716
2U-7141
L27
2U-8107
2U-7143
BK-18
BK-18
2U-8448
2U-8073
2U-8385
2U-7144
YL
RD
WH
GN
YL
RD
WH
GN
469-GN
614-PU
606-GY
450-YL
469-GN
539-BU
540-WH
604-OR
322-GY
403-GN
326-PU
400-GN
405-GY
406-PU
A
A
L28
539-BU
L4
L30
B-9012U-9478
C
AA
A
A
A
A
A
A
A
A
A
A
A
A
DD
DD
CC
CC
BB
BB
AA
AA
Z
Y
406-PU
405-GY
E
NOTE D: D250D ONLY
NOTES
X
X
112-PU-14
112-PU-14
V
110-GN
4
370-BU
C
507-WH
W
109-OR-10
109-OR-10
109-OR-6
C
W
W
469-GN
C A
V
C
A
K
A
A
A
A-6
1
617-BR617-BR
539-BU
540-WH
618-YL 618-YL
449-BU
477-YL
450-YL
469-GN
627-YL
L38
200-BK
L4
611-PU-14
619-GN-14
611-PU-14
3
619-GN-14
611-PU-14
619-GN-14619-GN-14
521-YL-14
521-YL-14
A
522-WH-14
00
2
9Y-1948Y
6
5
ALT
5
173-YL
200-BK
490-GN
706-BR
6
101-RD
112-PU
112-PU-14
105-BR
606-GY
610-OR-14
4
513-OR-14
522-WH-14
614-PU
614-PU
614-PU
614-PU
200-BK
200-BK
200-BK-14
8
605-YL
322-GY
200-BK-14
605-YL
A-6017U-9550EE
A
GROUND
C
BATTERY
SOLENOID
A
477-YL
449-BU
BK
200-BK-14
L4
443-YL
CONVERTER
TEMP SENDER
6N-5926
310-PU
322-GY
322-GY
322-GY
1
3
406-PU
407-PK
407-PK
2
200-BK
6
5
L22L22
D
D
B404-YL
311-WH
611-PU-14
454-GN
321-BR
E
E
507-WH
454-GN
454-GN
405-GY
C
C
C
C
C
C
C
324-BU
C
308-YL
103-YL-14
103-YL-14
103-YL-14
C
103-YL-14
103-YL-14
C
537-GN
103-YL-14
537-GN
C
C
C
C
E
200-BK-14
200-BK
OPERATOR STATION
200-BK-14
101-RD-6
304-WH-10
484-YL
200-BK
200-BK
C
C
W
C
406-PU
407-PK
200-BK
611-PU-14
200-BK
200-BK
200-BK
200-BK
200-BK
419-YL
469-GN
540-WH
OPERATOR STATION
OPERATOR STATION
103-YL
400-GN
200-BK
200-BK
200-BK
200-BK 200-BK
606-GY
200-BK
324-BU
200-BK
405-GY
200-BK
123-WH
200-BK
200-BK
200-BK-14
200-BK
DASH
GROUND
484-YL
432-PK
484-YL
477-YL
200-BK-14
200-BK
C
405-GY
407-PK
BU-18
406-PU
RD-18
405-GY
BK-18
322-GY
A
322-GY
200-BK-14
443-YL
B
400-GN
443-YL
506-PU
407-PK
310-PU
403-GN
400-GN
605-YL
326-PU
400-GN
627-YL
490-GN
706-BR
614-PU
611-PU-14
110-GN
L22
ALTERNATOR
CHARGE RELAY
9W-2494
308-YL
506-PU
DD
539-BU
A
539-BU
540-WH
540-WH
484-YL
506-PU
443-YL
540-WH
370-BU
403-GN
B404-YL
200-BK
469-GN
419-YL
450-YL 449-BU
173-YL
432-PK
572-PU
BB
374-PK
324-BU
604-OR
619-GN-14
L11
614-PU
614-PU
614-PU
614-PU
123-WH
123-WH
199-OR
190-PK
OPERATOR STATION
199-OR
BK
200-BK
611-PU-14
190-PK
706-BR
A958-WH
490-GN
L25
605-YL
A958-WH
C
507-WH
453-PK
L22
611-PU-14
484-YL
B
606-GY
605-YL
614-PU
B
L25
614-PU
200-BK-14
BK
B
NOTE E: WIRES ARE TO BE TIED BACK AND ENCAPSULATED
WITH HEAT SHRINK TUBING
D-5
501-GN
118-GY
500-BR
502-OR
FRONT WIPER
MOTOR GP
3E-5147
165-YL
103-YL
F
103-YL
102-BU-14
200-BK
200-BK
308-YL
102-BU-14
103-YL
611-PU-14
105-BR
310-PU
114-GN
611-PU-14
118-GY
+
123-WH
165-YL
130-GN
370-BU
105-BR
118-GY
173-YL
130-GN
R
A
CAB LAMPS
INDICATOR LAMPS
A958-WH
V
190-PK
103-YL
B
B
B
B
123-WH
A
539-BU
L42
123-WH
403-GN
123-WH
200-BK200-BK
+24
-
490-GN
324-BU
614-PU614-PU
123-WH
123-WH
374-PK
B
B
B
B
B
B
B
130-GN
A
130-GN
130-GN
130-GN
130-GN
130-GN
307-OR
130-GN
432-PK
130-GN
130-GN
130-GN
130-GN
130-GN
200-BK
130-GN
130-GN
324-BU
AA
BU
B
L4
123-WH
130-GN
165-YL
105-BR
624-YL
173-YL
118-GY
114-GN
130-GN
506-PU
500-BR
602-WH
200-BK
200-BK
130-GN
308-YL
501-GN
614-PU
614-PU
610-OR-14
SPEEDOMETER
8C-9808
TACHOMETER
9X-5523
LAMP
2U-4806
SERVICE
METER
6T-7337
326-PU
CONVERTER
TEMP GAGE
4W-2066
LAMP
2U-4806
322-GY
103-YL-14
102-BU-14
501-GN
419-YL
CAB
LAMP SW
6T-3990
HORN SW
3T-2357
FRONT
WIPER SW
3T-6655
103-YL
A
A
A
RUNNING
LAMP SW
8C-9636
627-YL
200-BK-14
L42
D
200-BK
L42
604-OR
619-GN-14
619-GN-14
432-PK
L42
432-PK
L41
L6
A
506-PU
L41
L41
L41
L41
D775-OR
453-PK
618-YL
617-BR
B762-GN
B761-YL
G
E
F
J
H
L
K
W
V
U
T
S
R
P
N
M
1
200-BK-14
324-BU
B
A
D
3
200-BK
522-WH-14
T
OPERATOR STATION
B
371-OR
BRAKE OIL
PRESSURE SW
7U-9037
L12
L2
521-YL-14
371-OR
L2
L23
432-PK
370-BU
370-BU
DIMMER SW
2H-1855
START AID
VALVE
9G-4365
A/C CLUTCH
SOLENOID
8T-8813
REFRIGERANT
SWITCH
5V-5698
NOTE A
START
AID SW
6T-6066
D
D
432-PK
3
200-BK
STOP LAMP SW
7U-9036
604-OR
BK
L39
D
D
173-YL
L39
RH BACK UP
LAMP
9X-1439
BULB
9X-3463
500-BR
60A
540-WH
124-GN-14
200-BK
158-BR
173-YL
158-BR
DIFF LOCK
L38
L38
10A
121-YL
L38
CAB LAMP
9X-1439
200-BK
L38
624-YL
L38
484-YL
LIMIT SWITCH AS. 2U-9160
YL
YL
BU
506-PU
FRONT
WASHER MOTOR
2U-4570
MOTOR
4
2
L23
2
4
3
1
K
DIFF
LOCK SW
3E-0307
477-YL
A
WH
449-BU
SPEEDOMETER
SPEED PICKUP
9X-5393
F-10
B-2
NOTE LOC
E
E
618-YL
112-PU-14
200-BK
112-PU-10
Z
2
E
8
7
E
3
1
E
4
E
E
E
321-BR
200-BK
200-BK
200-BK
614-PU 614-PU
606-GY
NOTE C: D20D ONLY
605-YL
606-GY
604-OR
614-PU
604-OR
B-1
X
WIRE AS.
J
321-BR
200-BK-14
200-BK-14
H
321-BR
604-OR
L22
604-OR
321-BR
200-BK-14
LAMP
LH BACK UP
LAMP
9X-1439
BULB
9X-3463
200-BK
200-BK
200-BK
BACK UP
ALARM
3T-1815
321-BR
321-BR
200-BK
614-PU
604-OR
614-PU
604-OR
605-YL
LH STOP/TAIL/TURN
LAMP
2U-9213
BULB
7H-2976
3H-2691
RH STOP/TAIL/TURN
LAMP
2U-9213
BULB
7H-2976
3H-2691
614-PU
606-GY
102-BU-14
502-OR
BK
308-YL
101-RD-14
101-RD-14
101-RD
RUN LAMPS
BREAKER
9G-9487
10A
370-BU
306-GN
NOTE F: NOT REQUIRED ON THIS MODEL
130-GN
D
101-RD-14
101-RD-14
BR
D
112-PU-14
130-GN
109-OR-6
124-GN-14
D
D
D
610-OR-14
105-BR
109-OR-6
109-OR-6
101-RD-6
101-RD-14
B-2
D
ALT BREAKER
9S-0174
AIR CONDITIONER
BREAKER
6N-8589
HEADLAMP
BREAKER
6N-8589
KEY BREAKER
9G-9487
101-RD
112-PU-14
NOTE G
624-YL
190-PK
103-YL
124-GN-14
101-RD-6
200-BK-14
SEE
AREA G
105-BR
101-RD-14
A
200-BK
308-YL
200-BK-14200-BK-14
ALTERNATOR
5N-5692
RESISTOR
9G-1950
BLOWER
9G-8697
WH/RD-14
BK-14
WH/RD-14
BK-14
BLOWER
9G-8693
200-BK-14
200-BK-14200-BK-14
515-GY-14
515-GY-14
4
THERMOSTAT
3E-5464
200-BK-14
124-GN-14
200-BK-14
521-YL-14
515-GY-14
522-WH-14
522-WH-14
BLOWER SW
6P-3236
3
4
5
515-GY-14
5
3
521-YL-14
124-GN-14
200-BK-14
517-BU-14
516-GN-14
515-GY-14
517-BU-14
2
1
112-PU-10
101-RD
Z
199-OR
200-BK
539-BU
502-OR
505-BU
706-BR
504-YL
503-BR
L4
BODY TIP
SW 7U-6554
BK-18
RD
GY
GN
BK
YL
WHWH
YL
BK
605-YL
BK-18
GN
DOWN DIRECT
DOWN
UP
UP DIRECT
GY
9
200-BK
Y
200-BK
200-BK-14
200-BK-14
A958-WH
200-BK
419-YL
200-BK
200-BK
199-OR
374-PK
540-WH
RETARDER
NOTE B
450-YL
324-BU
10A
PARK BRAKE
PRESSURE
SWITCH
102-3648
PARK BRAKE
SOLENOID
3E-9257
513-OR-14
200-BK
200-BK
200-BK-10
200-BK-10
200-BK-14
200-BK-14
200-BK-10
200-BK
200-BK
301-BU-10
507-WH
200-BK-10
326-PU
ENGINE
SHUTDOWN
SOLENOID
8C-3663
450-YL
200-BK
TACHOMETER
ENGINE SPEED
PICK UP
5N-9292
ENGINE OIL
PRESSURE SW
9X-4276
405-GY
400-GN
469-GN
200-BK
611-PU-14
454-GN
610-OR-14
614-PU
614-PU
200-BK-14
415-GN
539-BU
540-WH
619-GN-14
619-GN-14
200-BK
RD
J
INHIBIT
J
200-BK-14
BK-6
200-BK
200-BK
J
324-BU
200-BK
200-BK
411-PK
490-GN
201-BK
C
B
200-BK
EE
L20
101-RD-6
L28
200-BK
BK
XSMN LOCK UP
PRESSURE SW
9X-4276
4
2
1
3
3
1
2
4
B
NOTE C
199-OR
L28
U
LH STOP/TAIL/TURN
LAMP
2U-9213
BULB
7H-2976
3H-2691
RETARDER INHIBIT
PRESSURE SW
2U-9444
SUPPLY
12V BATTERY
3T-5760
706-BR
12V BATTERY
3T-5760
DISCONNECT SW
7N-0718
FRAME
GROUND
AUX START
RECEPTACLE
BK-00
BK-00BK-00
101-RD-6
RD-00
RD-00
TO ENG
BLOCK
STARTER
9X-9995
BK-4
RD-00
BK-00
200-BK-10
200-BK-14
301-BU-10
BK-00
200-BK-14
109-OR-10
TO
FRAME
BK-00
200-BK
407-PK
321-BR
200-BK
C
J
200-BK
200-BK
J
3
200-BK-14
200-BK-14
200-BK
00
COOLANT
TEMP SW
9W-1519
COOLANT
TEMP SW
8C-3569
160-BU
200-BK
GN
610-OR-14
321-BR
B-1
130-GN
14
5
6
2
3
ST
ON
OFF
B
S
C
R
606-GY
200-BK
BU-18
RD-18
BK-18
200-BK
311-WH
301-BU-10
200-BK
618-YL
L17
L37
B
L37
L36
L36
L36
L35
L35
L10
L29
10A
RH BACK UP
LAMP
9X-1439
BULB
9X-3463
15A
KEY
START SW
9G-7641
TURN
SIGNAL SW
9G-5589
FLASHER
8D-6946
112-PU-14
112-PU
112-PU
112-PU-14
HEADLAMP
101-4356
112-PU
HEADLAMP
101-4356
112-PU-14
HORN
BODY TIP CONTROL
EE
FRONT WASH/WIPE
GAGES
START AID
PARK BRAKE
CAB LAMPS
INDICATOR LAMPS
10A
10A
10A
10A
10A
10A
10A
10A
BACK UP
ALARM SW
3T-3132
15A
130-GN
173-YL
190-PK
165-YL
123-WH
118-GY
160-BU
114-GN
121-YL
101-RD
101-RD
BACKUP ALARM
477-YL
SIG
443-YL
SIG
-
+24
123-WH
10A
+-
IGN
SEND
GRD
RIGHT TURN
INDICATOR
7N-9967
BASE
2G-0151
RETARDER
INDICATOR
7N-9967
BASE
2G-0151
TRANSMISSION
TEMP
INDICATOR
7N-9967
BASE
2G-0151
ALTERNATOR
INDICATOR
7N-9967
BASE
2G-0151
BRAKE OIL
LOW PRESSURE
INDICATOR
7N-9967
BASE 2G-0151
COOLANT
TEMP
INDICATOR
7N-9967
BASE 2G-0151
ENGINE OIL
PRESSURE
INDICATOR
7N-9967
BASE 2G-0151
614-PU
HI BEAM
INDICATOR
7N-9967
BASE
2G-0151
L14
TRANSMISSION
LOCK UP
INDICATOR
7N-9967
BASE
2G-0151
PARK BRAKE
INDICATOR
7N-9967
BASE
2G-0151
LOW
FUEL LEVEL
INDICATOR
7N-9967
BASE
2G-0151
LEFT TURN
INDICATOR
7N-9967
BASE
2G-0151
BR
BR
DIFFERENTIAL
LOCK
INDICATOR
7N-9967
BASE
2G-0151
L35
L35
L34
B
2
B
B
L34
L34
L34
L34
L33
BU-18
BK-18
419-YL
374-PK
200-BK
B
B
B
B
B
B
B
B
B
B
B
B
B
3
2
6
5
DOME LAMP
8C-9678
B
W P
L
H
B
105-BR
165-YL
130-GN
123-WH
114-GN
173-YL
102-BU-14
103-YL-14
118-GY
B
C
E
C
D
L13
L12
419-YL
306-GN
200-BK
200-BK
200-BK
200-BK-14
C/B PANEL GND
200-BK-14
200-BK
160-BU
B762-GN
B761-YL
BODY TIP CONTROL
SW
2U-6683
INHIBIT
SUPPLY
LOWER
RAISE
WH
BK
GN
YL
4
3
2
1
L42
NOTE G
200-BK
F
507-WH
200-BK-14
419-YL
503-BR
504-YL
505-BU
200-BK-14
200-BK-14
FUSE
HOLDERS
4K-5122
FUSES
10A-3K-8782
L33
110-GN
NOTE G
D775-OR
BODY TIP
SOLENOID
(LOWER)
2U-7294
BODY TIP
SOLENOID
(RAISE)
2U-7294
B761-YL
B762-GN
450-YL
200-BK
200-BK
200-BK
B
A
200-BK
L6
F
E
614-PU
200-BK
L2
2U-9264
B762-GN
B761-YL
611-PU-14
L33
L33
200-BK
L33
200-BK-14
618-YL
606-GY
200-BK
200-BK
F
E
D
C
B
A
HARNESS AS,
W
FUEL
LEVEL SW
7X-1161
RETARDER
SOLENOID
2U-9195
NOTE B
L6
WH
WH
618-YL
617-BR
RETARDER
SWITCH
CONTROL
2U-8853
200-BK-14
NOTE G
R
307-OR
Q
614-PU
604-OR
P
614-PU
604-OR
BR
OR
606-GY
605-YL
618-YL
200-BK
A
E
H
H
3
2
1
BK-18
RD-18
WH-18
C
324-BU
158-BR
324-BU
604-OR
321-BR
A
200-BK
200-BK
304-WH-10
L29
173-YL
112-PU
L32
START RELAY
9F-3099
MAIN POWER
RELAY
3T-0376
304-WH-10
D
C
103-YL
306-GN
200-BK-14
158-BR
118-GY
173-YL
124-GN-14
121-YL
L32
L32
L32
A
A
A
A
F
200-BK
200-BK-14
D
L8
200-BK
160-PU
617-BR
627-YL
FRONT WASH/WIPE
A
D
J
J
200-BK
6
200-BK
374-PK
121-YL
DOME
LAMP SW
9D-4068
C
200-BK
118-GY
624-YL
502-OR
500-BR
A
324-BU
501-GN
200-BK
200-BK
L
H
P
B+
GND
MOTOR
OR
BR
GY
GN
BK
L6
1
7
OPERATOR STATION
324-BU
F
J
J
J
J
324-BU
L27
602-WH
FF
103-YL
F
J
J
D
T
T
NEGPOSNEGPOS
G S
MTR BAT
MOTOR
C
2
406-BU
200-BK
611-PU-14
619-GN-14
D
L2
L1
419-YL
NEUTRAL
START SW
2U-8834
L11
321-BR
103-YL
DIFFERENTIAL
LOCK SOLENOID
2U-6512
L15
L26
L26
L26
2
1
HORN
HI TONE
7T-0970
HORN
LO TONE
7T-0969
CABLE AS.
CC
201-BK
200-BK
C
REAR WASH/WIPE
112-PU
C
NOTE E
NOTE A: NORMALLY OPEN BEFORE REFRIGERANT CHARGE
UNLESS OTHERWISE SPECIFIED: ALL WIRE IS 16 GAGE
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF
THIS SCHEMATIC IS FOR THE D20D AND D250D
ARTICULATED DUMP TRUCKS (6V-5895 CHG 00).
IDENT PART NO. LOC
NOTE B: ATTACHMENT ON D250D
UNLESS OTHERWISE SPECIFIED: ALL WIRES IN A SPLICE
ARE THE SAME IDENT. NUMBER, COLOR, AND 16 GAGE
AND XMSN SHIFTER IN NEUTRAL
V
CHG
X
N
200-BK
112-PU-14
NOTE G
200-BK
160-BU
BODY TIP CONTROL
BK
BK
YL
YL
706-BR
CONV TEMP SW
9X-5602
572-PU
LH BACK UP
LAMP
9X-1439
BULB
9X-3463
REAR WASH/WIPE
C
MOTOR
MOTOR
L37
ALL DASHED LINES ARE ATTACHMENTS.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS OFF.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS ON.
STARTING CIRCUIT.
GAUGE CIRCUIT.
MONITOR CIRCUIT.
PANEL LAMP CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
ENGINE SHUTDOWN CIRCUIT.
TURN SIGNAL CIRCUIT.
START AID CIRCUIT.