Component LocationsComponents in the operator Station Tractor Mounted Components
IDENT Component Schematic Location IDENT Component Schematic
Location1 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 DescriptionWire
NumberWire Color Description Wire
NumberWire 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 GNFUSE 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
PressureSymbol
TemperatureSymbol
LevelSymbol
FlowSymbol
A AA
2
A AA1
2
325-PK-14C 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
SocketPin
Pin or Socket Number
Wire, Cable, or Harness Assembly Identification
Single Wire Connector
Circuit Number Identification
Wire Gauge
WireColor
Plug Receptacle
9X-1123
Component Part Number
Electrical Schematic Symbols And Definitions
11 12 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.
SENR8232March 1993
D20D & D250D
Electrical System
6NG1-UP9MG1-UP
Articulated Trucks
©1993 CaterpillarAll Rights Reserved
Printed in U.S.A.
3
4 5
57
62
6
61
64
63
60
89
10
11
12
14
15 13
16
1
11
12
2
17
18
19 20
21 2223
24 2526
27
2829
30
3132 37 3533 34
38
7
39
43
45
47
48
49
50
51
52
53
58
55
56
Operators Station
59
6968
6968
67
66
65
78
79
81
83
88
87
86
82
84
70
79787472
77
80
86
82
85
103
105
104
104
106
36
36
72
76
74
77
70
75
7173
40
41
41
46
6540 46
54
54
Engine and Transmission - Right Side
Engine and Transmission - Left Side
89
94
97
93
95
91
9296
9099
98
100
102101
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
21
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
35 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-BK419-YL
FF
B-5A-8A-8A-8
AREA GTILT CAB CONVERSION HARNESSES
A-7A-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-WH614-PU706-BR490-GN
326-PU
605-YL
400-GN403-GN
310-PU
606-GY
469-GN450-YL477-YL449-BU
540-WH539-BU
V
405-GY406-PU407-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-OR453-PK618-YL617-BRB762-GNB761-YL
200-BK-14324-BU321-BR419-YL521-YL-14522-WH-14619-GN-14604-OR U
LAMP2U-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-BK200-BK
322-
GY
322-
GY
322-GY
130-GN
SEE AREA G
L31
443-YL109-OR-10
SEE AREA G
453-PK
200-BK-14
490-GN
130-
GN
370-
BU
BB
BB
30
484-YL
B
310-PU
SEE AREA G
443-YL
TO AUXSTOP LAMPS SW
160-PU
D
610-
OR
-14
+-
EMSTESTSWITCHNOTE F
FAULT LAMPNOTE F
L28
L51 L51
L51 L51
L51
L51
L51 L51
L50
L50
L50
L49L49
CIRCUIT GROUPINGDESIGNATION
#L
ATCH WIRE, CABLE,COMPONENT
CIRCUIT NOT CONNECTED
CIRCUIT CONNECTED
BLUEGREEN
BUGN
RDWHORYLPKBK
BLADE, SPADE, RING,OR SCREW TERMINAL
INTERNAL ELECTRICALCONNECTION TO SURFACEOF COMPONENT
ELECTRICAL CONNECTIONTO VEHICLE STRUCTURE
CONNECTOR
SYMBOL DESCRIPTION
BROWNPURPLEGRAYBLACK
COLORABBREV
PINKYELLOWORANGE
D775-OR
D775-OR
L6449-BU477-YL
507-WH506-PU
507-WH
453-
PK
200-
BK
L49
L49
L49
L49
L39
L39 B762-GNB761-YL
B
505-
BU
504-
YL
503-
BR
WHITE
617-BR617-BR
618-YL617-BR
618-YL
505-BU
618-YL617-BR
B
617-BR
BB
NOTE G
A
200-BK
504-YL
618-YL
503-BR
110-
GN
ATCH
99
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-YL617-BR
618-YL617-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
ATCHATCHATCH
0000000001
105-9677103-5907103-5908
RED
BR
12
FF
104-4368103-5905
ATCH01103-5906
DD
U
NOTE D
A-11B-11
002U-9023002U-9024
M
TS
L
M
L
200-BK200-BK
L39
FF
H
E
E
E
E
200-BK
321-BR
RH STOP/TAIL/TURNLAMP2U-9213BULB7H-29763H-2691
605-YL604-OR614-PU
604-OR614-PU
200-BK
321-BR
321-BRBACK UPALARM3T-1815
200-BK
200-BK
200-BK
200-
BK
-14
321-
BR
604-
OR
604-
OR
606-GY
614-
PU
614-
PU
200-
BK
200-
BK
200-
BK
E
PUGY
E
CAB TOGROUNDSTRAP
N
110-GN
614-PU
614-PU
419-
YL
371-
OR
D77
5-O
R
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
L45L45
L45L45
L45
L44
L44L44
L44
L44
L40L40
L40
L40
L40L40
200-
BK
200-
BK
L40
STEERINGPRESSURE SW8T-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
STEERINGPRESSUREINDICATOR7N-9967BASE2G-0151 B B
110-GN
432-
PK
370-BU
L43
371-OR
L43
L43
C
B
110-GN
110-
GN
C
112-PU
371-ORAUXSOUNDER2U-8863
130-GN
10A
L43
130-
GN
419-YL
L43
L42
L42 L42
L42 L42
L42 L42
RDRD
374-
PK
374-PK
PARK BRAKE SW102-9371
307-OR
PARK BRAKERELAY3T-2170
B B
B
374-PK
374-PK
B765-BR
B765-BR
B765-BR
B765-BR
B765-BR
B765-BR 190-PK
B
BB
B
ALARM9G-9813
DIODE BLOCK2U-4539
B
L4
L1
L1
L2
L2
L6
L7 L5
L7
L7
L12L12
L14L14
L13
L18
L18
L5
L5
L7
L18
L8
PK
L9
L9L9
L18
L1
L2
L6
L10
L17L15
L15
L31
L17
L17L7
L16
L6L13
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
L11L11
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
GNGN
L21
L29L29
L27
BBBBBBBBBBBBBBB 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-54187U-89837U-95027U-8984
00000001007U-5670
2U-89247U-7950
0100009Y-1267
A-5A-5A-5A-6A-6
D-4D-4A-2
C-5B-12
L29
C-7B-12B-11C-5D-8F-2E-1
00
0100
L27
00
0002010102
2U-8948
9X-47162U-7141
L27
2U-8107
2U-7143
BK-18BK-18
2U-84482U-80732U-83852U-7144
YLRDWHGN
YLRDWHGN
469-
GN
614-PU606-GY
450-YL469-GN539-BU540-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
AA
A
A
A
DD
DDCCCCBBBBAA
AA
ZY
406-PU405-GY
E
NOTE D: D250D ONLY
NOTES
X
X
112-PU-14
112-PU-14
V
110-
GN
4
370-BU
C
507-WH
W109-OR-10
109-OR-10
109-OR-6CW
W
469-GN
C A
V
CA
K
A
A A
A-6
1
617-
BR
617-
BR
539-BU540-WH
618-
YL
618-
YL
449-BU477-YL450-YL469-GN
627-
YL
L38
200-
BK
L4
611-PU-14
619-
GN
-14
611-
PU
-143
619-
GN
-14
611-
PU
-14
619-GN-14619-GN-14521-YL-14
521-YL-14A
522-WH-14
00
2
9Y-1948Y
65
ALT
5
173-YL
200-BK
490-GN
706-BR
6
101-RD
112-PU112-PU-14
105-BR
606-GY
610-OR-14
4
513-OR-14
522-WH-14
614-PU614-PU
614-PU614-PU
200-BK200-BK
200-BK-14
8
605-YL
322-
GY
200-BK-14605-YL
A-6017U-9550EE
A
GROUND
C
BATTERYSOLENOID
A
477-YL449-BU
BK
200-
BK
-14
L4
443-YLCONVERTERTEMP SENDER6N-5926
310-PU
322-GY
322-GY
322-GY
13
406-
PU
407-
PK
407-
PK
2
200-
BK
65
L22L22
D
D
B40
4-Y
L
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-14103-YL-14
C
103-YL-14103-YL-14
C
537-
GN
103-YL-14 537-GN
C
C
C
C
E
200-BK-14200-BK
OPERATOR STATION
200-BK-14
101-RD-6304-WH-10
484-
YL
200-
BK
200-
BK
C
C
W
C
406-PU407-PK
200-
BK
611-
PU
-14
200-
BK
200-
BK
200-
BK
200-
BK
200-
BK
419-YL469-GN540-WH
OPERATOR STATION
OP
ER
ATO
R S
TAT
ION
103-YL
400-GN
200-BK200-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
DASHGROUND
484-YL
432-
PK
484-YL
477-YL
200-BK-14200-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-GN400-GN
605-YL
326-PU
400-
GN
627-YL
490-GN706-BR614-PU
611-
PU
-14
110-GN
L22
ALTERNATORCHARGE RELAY9W-2494
308-YL
506-PU
DD
539-BU
A
539-BU540-WH
540-WH
484-YL
506-PU
443-
YL
540-WH
370-BU
403-GN
B404-YL200-BK
469-
GN
419-
YL
450-YL 449-BU
173-YL432-PK
572-PU
BB
374-PK324-BU604-OR
619-GN-14
L11
614-PU614-PU
614-PU614-PU
123-WH123-WH
199-OR
190-PK
OP
ER
ATO
R S
TAT
ION
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-GN118-GY500-BR502-OR
FRONT WIPERMOTOR GP3E-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 BBB
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
BBBBBB 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-WH130-GN165-YL105-BR
624-YL173-YL
118-GY
114-GN
130-GN
506-PU500-BR
602-WH
200-BK
200-BK
130-
GN
308-YL
501-GN
614-PU614-PU
610-OR-14
SPEEDOMETER8C-9808
TACHOMETER9X-5523LAMP2U-4806
SERVICEMETER6T-7337
326-PU
CONVERTERTEMP GAGE4W-2066LAMP2U-4806
322-GY
103-YL-14
102-BU-14
501-GN
419-YL
CAB LAMP SW6T-3990
HORN SW3T-2357
FRONT WIPER SW3T-6655
103-YL
AA
A
RUNNINGLAMP SW8C-9636
627-
YL
200-BK-14
L42
D
200-BK
L42
604-OR619-GN-14
619-GN-14
432-
PK
L42
432-PK
L41
L6
A
506-
PU
L41L41L41
L41
D775-OR453-PK618-YL617-BRB762-GNB761-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 SW7U-9037
L12
L2
521-YL-14
371-OR
L2
L23
432-PK
370-BU
370-BU
DIMMER SW2H-1855
START AIDVALVE9G-4365
A/C CLUTCHSOLENOID8T-8813
REFRIGERANTSWITCH5V-5698NOTE A
START AID SW6T-6066
D
D
432-
PK
3
200-
BK
STOP LAMP SW7U-9036
604-OR
BK
L39
D D173-YL
L39
RH BACK UPLAMP9X-1439BULB9X-3463
500-BR
60A
540-
WH
124-GN-14
200-BK
158-BR173-YL
158-BR DIFF LOCK
L38L38
10A
121-YL
L38
CAB LAMP9X-1439
200-
BK
L38
624-
YL
L38
484-
YL
LIMIT SWITCH AS. 2U-9160
YL YL
BU
506-PU
FRONTWASHER MOTOR2U-4570
MOTOR
4 2
L23
2431
K DIFFLOCK SW3E-0307
477-YL
AWH 449-BU
SPEEDOMETERSPEED PICKUP9X-5393
F-10B-2
NOTE LOCE
E
618-YL
112-PU-14
200-BK
112-PU-10
Z
2
E
87
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 UPLAMP9X-1439BULB9X-3463
200-BK
200-BK
200-BK
BACK UPALARM3T-1815
321-BR
321-BR
200-BK
614-PU604-OR
614-PU604-OR605-YLLH STOP/TAIL/TURN
LAMP2U-9213BULB7H-29763H-2691
RH STOP/TAIL/TURNLAMP2U-9213BULB7H-29763H-2691
614-
PU
606-
GY
102-BU-14
502-OR
BK
308-YL
101-RD-14101-RD-14
101-RD
RUN LAMPS BREAKER9G-9487
10A
370-BU
306-GN
NOTE F: NOT REQUIRED ON THIS MODEL
130-GN
D
101-RD-14101-RD-14
BR
D
112-PU-14
130-GN
109-OR-6
124-GN-14
D
D
D610-OR-14
105-BR
109-OR-6
109-OR-6
101-RD-6101-RD-14
B-2
D
ALT BREAKER9S-0174
AIR CONDITIONERBREAKER6N-8589
HEADLAMP BREAKER6N-8589
KEY BREAKER9G-9487
101-RD
112-PU-14
NOTE G
624-YL
190-PK
103-YL
124-GN-14101-RD-6
200-BK-14
SEEAREA G
105-BR
101-RD-14
A
200-
BK
308-YL
200-
BK
-14
200-
BK
-14
ALTERNATOR5N-5692
RESISTOR9G-1950
BLOWER9G-8697
WH/RD-14
BK-14
WH/RD-14
BK-14
BLOWER9G-8693
200-BK-14
200-BK-14200-BK-14
515-GY-14
515-GY-14
4
THERMOSTAT3E-5464
200-BK-14
124-GN-14
200-BK-14
521-YL-14515-GY-14
522-WH-14
522-
WH
-14
BLOWER SW6P-3236
345
515-GY-14
5352
1-Y
L-14
124-
GN
-14
200-
BK
-14
517-BU-14516-GN-14515-GY-14
517-BU-14
21
112-PU-10
101-RD
Z
199-OR
200-BK
539-
BU
502-OR
505-BU
706-BR
504-YL503-BR
L4
BODY TIP SW 7U-6554
BK
-18
RDGYGNBK
YLWHWH
YL
BK
605-
YL
BK
-18
GN DOWN DIRECTDOWNUPUP DIRECT
GY
9
200-
BK
Y
200-
BK
200-
BK
-14
200-
BK
-14
A958-WH
200-BK
419-YL
200-BK200-BK
199-OR
374-PK
540-
WH
RETARDERNOTE B
450-
YL
324-BU
10A
PARK BRAKEPRESSURESWITCH102-3648
PARK BRAKESOLENOID3E-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-PUENGINESHUTDOWNSOLENOID8C-3663
450-
YL
200-
BK
TACHOMETER ENGINE SPEED PICK UP5N-9292
ENGINE OIL PRESSURE SW9X-4276
405-
GY
400-
GN
469-
GN
200-
BK
611-PU-14
454-GN610-OR-14
614-PU
614-PU200-BK-14
415-
GN
539-BU
540-WH619-GN-14
619-GN-14
200-
BK
RD
J
INHIBIT
J
200-
BK
-14
BK-6
200-
BK
200-
BK
J
324-BU200-BK
200-
BK
411-
PK
490-
GN
201-
BK
CB
200-
BK
EE
L20
101-RD-6
L28
200-
BK
BK
XSMN LOCK UPPRESSURE SW9X-4276
42
13
31
24
B
NOTE C
199-OR
L28
U
LH STOP/TAIL/TURNLAMP2U-9213BULB7H-29763H-2691
RETARDER INHIBITPRESSURE SW2U-9444
SUPPLY
12V BATTERY3T-5760
706-BR
12V BATTERY3T-5760
DISCONNECT SW7N-0718
FRAMEGROUND
AUX STARTRECEPTACLE
BK-00
BK-00BK-00
101-RD-6
RD-00RD-00
TO ENGBLOCK
STARTER9X-9995
BK
-4
RD-00BK-00
200-BK-10
200-BK-14301-BU-10
BK-00
200-
BK
-14
109-OR-10
TOFRAME
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 SW9W-1519
COOLANT TEMP SW8C-3569
160-BU
200-
BK
GN
610-
OR
-14
321-BR
B-1
130-
GN
14
56
23
STONOFF
BSC
R
606-GY
200-BK
BU
-18
RD
-18
BK
-18
200-BK
311-
WH301-BU-10
200-BK
618-YL
L17
L37
B
L37
L36
L36 L36
L35L35
L10
L29
10A
RH BACK UPLAMP9X-1439BULB9X-3463
15A
KEY START SW9G-7641
TURNSIGNAL SW9G-5589
FLASHER8D-6946
112-PU-14
112-PU
112-PU
112-PU-14
HEADLAMP101-4356
112-PU
HEADLAMP101-4356
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 UPALARM SW3T-3132
15A
130-GN
173-YL
190-PK
165-YL
123-WH
118-GY
160-BU
114-GN
121-YL
101-RD
101-RDBACKUP ALARM
477-
YL
SIG
443-YL
SIG
-+24
123-WH
10A
+-
IGN
SEND
GRD
RIGHT TURNINDICATOR7N-9967BASE2G-0151
RETARDER INDICATOR7N-9967BASE2G-0151
TRANSMISSION TEMPINDICATOR7N-9967BASE2G-0151
ALTERNATORINDICATOR7N-9967BASE2G-0151
BRAKE OILLOW PRESSUREINDICATOR7N-9967BASE 2G-0151
COOLANTTEMP INDICATOR7N-9967BASE 2G-0151
ENGINE OILPRESSUREINDICATOR7N-9967BASE 2G-0151
614-PU
HI BEAMINDICATOR7N-9967BASE2G-0151
L14
TRANSMISSION LOCK UPINDICATOR7N-9967BASE2G-0151
PARK BRAKEINDICATOR7N-9967BASE2G-0151
LOW FUEL LEVELINDICATOR7N-9967BASE2G-0151
LEFT TURNINDICATOR7N-9967BASE2G-0151
BR
BR
DIFFERENTIALLOCK INDICATOR7N-9967BASE2G-0151
L35L35
L34
B
2
B
B
L34
L34L34
L34
L33
BU-18
BK-18
419-
YL
374-
PK
200-BK
BB
B
B
B
B
B
B
BBB
B
B
32
65
DOME LAMP8C-9678
B
W PL
HB
105-
BR
165-
YL
130-
GN
123-
WH
114-
GN
173-
YL
102-
BU
-14
103-
YL-
1411
8-G
Y
B
C
E
CD
L13
L12
419-YL306-GN
200-BK
200-BK200-BK
200-BK-14C/B PANEL GND
200-
BK
-14
200-BK
160-BU
B762-GNB761-YL
BODY TIP CONTROLSW 2U-6683
INHIBITSUPPLYLOWERRAISE
WHBKGNYL
4 3 2 1
L42
NOTE G
200-
BK
F
507-WH
200-BK-14
419-YL
503-BR504-YL505-BU
200-BK-14200-BK-14
FUSEHOLDERS4K-5122
FUSES10A-3K-8782
L33
110-GN
NOTE G
D775-OR
BODY TIPSOLENOID(LOWER)2U-7294
BODY TIPSOLENOID(RAISE)2U-7294
B761-YL
B762-GN
450-YL
200-BK
200-BK
200-BKB
A
200-
BK
L6
F
E
614-PU
200-BK
L2
2U-9264
B762-GNB761-YL
611-PU-14
L33
L33
200-BK
L33
200-
BK
-14
618-YL606-GY
200-BK
200-
BK
F
EDCBA
HARNESS AS,
W
FUELLEVEL SW7X-1161
RETARDERSOLENOID2U-9195NOTE B
L6
WH
WH
618-
YL
617-
BR
RETARDER SWITCHCONTROL2U-8853
200-
BK
-14
NOTE G
R
307-OR
Q
614-PU604-OR
P
614-PU604-OR
BROR
606-
GY
605-
YL
618-
YL
200-BK
A
E
H
H
3
2 1
BK-18RD-18WH-18
C
324-
BU
158-BR 324-BU
604-
OR
321-
BR
A
200-BK200-BK
304-WH-10
L29
173-
YL
112-PU
L32
START RELAY9F-3099
MAIN POWERRELAY3T-0376
304-WH-10
D C
103-
YL
306-GN200-BK-14158-BR
118-GY
173-YL124-GN-14121-YL
L32
L32
L32
A
A
A
A
F
200-BK200-BK-14
D
L8
200-BK
160-PU
617-
BR
627-
YL
FRONT WASH/WIPE
A
D
JJ
200-BK
6
200-BK
374-PK121-YL
DOMELAMP SW9D-4068
C
200-
BK
118-
GY
624-
YL
502-
OR
500-
BR
A
324-
BU
501-
GN
200-BK
200-BK
L
H
PB+
GNDMOTOR
ORBRGYGN
BK
L6
1 7
OP
ER
ATO
R S
TAT
ION
324-
BU
F
JJ
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-BU200-BK
611-PU-14619-GN-14
D
L2L1
419-
YL
NEUTRAL START SW2U-8834
L11
321-BR
103-
YL
DIFFERENTIALLOCK SOLENOID2U-6512
L15
L26
L26L26
21
HORNHI TONE7T-0970
HORNLO TONE7T-0969
CABLE AS.
CC
201-
BK
200-
BK
C
REAR WASH/WIPE
112-PU
CNOTE E
NOTE A: NORMALLY OPEN BEFORE REFRIGERANT CHARGEUNLESS OTHERWISE SPECIFIED: ALL WIRE IS 16 GAGE
COMPONENTS ARE SHOWN INSTALLED ON A FULLYOPERABLE MACHINE WITH THE KEY AND ENGINE OFF
THIS SCHEMATIC IS FOR THE D20D AND D250DARTICULATED DUMP TRUCKS (6V-5895 CHG 00).
IDENT PART NO. LOC
NOTE B: ATTACHMENT ON D250D
UNLESS OTHERWISE SPECIFIED: ALL WIRES IN A SPLICEARE 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
BKBK
YLYL
706-BR
CONV TEMP SW9X-5602
572-
PU
LH BACK UPLAMP9X-1439BULB9X-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 VOLTAGEWHEN 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.