©
1991 Caterpillar
All Rights Reserved
Printed in U.S.A.
SENR8221
October 1991
D300D Articulated Truck
Electrical System
5MG1-UP
73
75
74
76
82
102
78
106
104
54
33
105
103
81
80
85
86
84
72
61
38
83
32
77
49
60
79
65
62
75
49
61
65
38
63
83
32
72
77
64
73
74
71
67
69
71
70
67
66
69
68
70
66
68
59
37
42
87
59
37
42
63
64
64
63
28
25
29
36
24
31
35
23
47
56
39
50
55
30
26
4
5
46
52
57
10
9
27
53
43
15
22
18
19
7
1
20
34
17
40
41
16
8
44
45
12
2
48
14
11
51
21
6
13
3
58
Operators Station
92
95
101
88
93
96 89
91
94
99
90
100
98
97
96
90
99
Engine and Transmission - Left Side
Engine and Transmission - Right Side
Tractor Mounted Components
IDENT Schematic Component
Schematic
Location
IDENT Schematic Component
Schematic
Location
1
ALARM - FAULT C-4
60
AUXILARY START RECEPTACLE A-5
2
BREAKER - AIR CONDITIONER D-4
61
BATTERIES A-5
3
BREAKER - ALTERNATOR D-9
62
CONTROL - FRONT SUSPENSION F-12
4
BREAKER - ENGINE SHUTDOWN E-4
63
HORN - HIGH TONE B-1
5
BREAKER - HEADLAMP D-4
64
HORN - LOW TONE B-1
6
BREAKER - KEY E-4
65
LAMP - CAB C-9
7
BREAKER - RUNNING LAMPS D-4
66
LAMP - HIGH BEAM HEAD - RIGHT A-1
8
CONTROL ENGINE - SHUTDOWN E-1
67
LAMP - HIGH BEAM HEAD - LEFT B-1
9
CONNECTOR - DIAGNOSTIC F-9
68
LAMP - LOW BEAM HEAD - RIGH T A-1
10
FLASHER D-2
69
LAMP - LOW BEAM HEAD - LEFT B-1
11
FUSE - BACKUP ALARM D-7
70
LAMP - TURN/PARK - RIGHT- FRONT A-1
12
FUSE - BODY HOIST CONTROL E-5
71
LAMP - TURN/PARK - LEFT - FRONT C-1
13
FUSE - CAB LAMP/ STOP LAMP E-7
72
MOTOR - FRONT WASHER D-11
14
FUSE - HORN D-7
73
SOLENOID - BODY RAISE B-10
15
FUSE - GAUGES E-7
74
SOLENOID - BODY LOWER B-10
16
FUSE - INDICATOR LAMPS E-5
75
SOLENOID - FRONT SUSPENSION F-12
17
FUSE - OPERATOR MONITOR E-7
76
SOLENOID - PARK BRAKE B-10
18
FUSE - PARK BRAKE E-5
77
SOLENOID - START AID C-2
19
FUSE - RETARDER E-5
78
SWITCH - DISCONNECT A-4
20
FUSE - START AID D-7
79
SWITCH - FUEL LEVEL A-2
21
FUSE - SUSPENSION CONTROL E-7
80
SWITCH - LOCK UP PRESSURE B-6
22
FUSE - WASH/ WIPE E-5
81
SWITCH - HYDRAULIC OIL PRESSURE C-2
23
GAUGE - CONVERTER TEMPERATURE F-3
82
SWITCH - PARK BRAKE F-10
24
GROUND - DASHPANEL D-1
83
SWITCH - REFRIDGERENT B-2
25
INDICATOR - DIFFERENTIAL LOCK F-4
84
SWITCH - RETARDER E-10
26
INDICATOR - HIGH BEAM F-5
85
SWITCH - SUSPENSION INHIBIT E-11
27
INDICATOR - LEFT TURN F-6
86
SWITCH - STOP LAMP C-3
28
INDICATOR - RETARDER F-4
87
SWITCH - STEERING PRESSURE C-1
29
INDICATOR - RIGHT TURN F-4 Engine And Transmission Mounted Components
30
INDICATOR - CONVERTER LOCK
F-5
IDENT
Schematic Component
Location
31
LAMP - AIR PRESSURE INDICATOR
E-6
88
ALTERNATOR A-2
32
LAMP - DOME
B-7
89
MOTOR - STARTER
A-6
33
LAMP - MASTER FAULT
F-2
90
PICK-UP - SPEEDOMETER SPEED
E-11
34
METER - SPEEDO
E-4
91
PICK-UP - TACHOMETER ENG. SPEED
RESISTOR
A-3
35
METER - SERVICE HOUR
E-6
92
A-6
36
METER - TACHO
E-5
93
SENDER- CONVERTER TEMPERATURE
C-11
37
MOTOR - BLOWER
B-5
94
SOLENOID - AIR CONDITIONING CLUTCH
B-3
38
MOTOR - WIPER
B-6
95
SOLENOID - ENGINE SHUTDOWN
A-2
39
PANEL - OPERATOR MONITOR
F-1
96
SWITCH - CONVERTER TEMPERATURE
E-11
40
RELAY - MAIN POWER
D-4
97
SWITCH - COOLANT TEMPERATURE
A-4
41
RELAY - START
D-9
98
SWITCH - COOLANT TEMPERATURE
(ETHER INHIBIT)
A-4
42
RESISTOR - AIR CONDITIONER/HEATER
B-5
99
SWITCH - DIFF LOCK
D-11
43
SWITCH - BACK-UPALARM
C-1
100
SWITCH - ENGINE OIL PRESSURE
A-3
44
SWITCH - BLOWER
B-6
101
SWITCH - FUEL
A-3
45
SWITCH - BODY HOIST CONTROL
B-8
46
SWITCH - BODY HOIST
B-7 IDENT
Schematic Component
Schematic
Location
47
SWITCH - CAB LAMP
F-7 102 ALARM - BACKUP A-12
48
SWITCH - DIMMER
C-2 103 LAMP - BACKUP A-12
49
SWITCH - DOME LAMP
B-7 104 LAMP - FLOOD A-12
50
SWITCH - FRONT WIPER
E-8 105 LAMP - STOP/TAIL/TURN - RIGHT A-12
51
SWITCH - HORN
F-8 106 LAMP - STOP/TAIL/TURN - LEFT B-12
52
SWITCH - KEY START
E-3
53
SWITCH - NEUTRAL START
B-7
54
SWITCH - OPERATOR MONITOR TEST
F-3
55
SWITCH - PARK BRAKE
F-9
56
SWITCH - RUNNING LAMP
F-8
57
SWITCH - START AID
F-3
58
SWITCH - TURN SIGNAL
E-2
59
THERMOSTAT
B-5
Components In The Opertators Station
Trailer Mounted Components
Schematic
Circuit
Number
Color Power Distribution Circuits
Circuit
Number
Color Monitoring Circuits
101 RD BATTERY 415 GN OPERATOR MON PANEL TEST SW.
102 BU HEAD LAMP 417 GY PRIMARY STEERING PUMP
103 YL DOME/DASH/PARK/TAIL LAMP PRESSURE SW. TO EMS
105 BR KEY SWITCH 419 YL OPERATOR MON PANEL PARK
107 WH ENGINE SHUTDOWN CONTROL BRAKE
109 OR ALTERNATOR OUTPUT (+) TERM. 432 PK OPERATOR MON PANEL BRAKE
112 PU MAIN POWER RELAY OUTPUT PRESSURE
113 OR OPERATOR MONITOR PANEL 443 YL POWER TRAIN TEMP GAUGE
114 GN WARNING HORN (FORWARD) 449 BU SPEEDO SENDER
118 GY WINDSHIELD WIPER SW. (FRONT) 450 YL TACOMETER SENDER(+)
121 YL BACK UP ALARM/LAMP 451 BR TACOMETER SENDER(-)
123 WH GAUGES 454 GN RETARDER INDICATOR LAMP
124 GN HEATER/AIR CONDITIONER SW. 469 GN FUEL LEVEL SENDER
125 OR SUSPENSION FUSE TO SUSPENSION 477 YL SPEEDO PROBE
130 GN INDICATOR LAMPS 490 GN LOCK UP INDICATOR LAMP
160 BU BODY HOIST FUSE TO SOLENOIDS 498 WH DIFF LOCK INDICATOR LAMP
165 YL START AID FEED
ACCESSORY CIRCUITS
173 YL WORK/STOP LAMP 500 BR WIPER - FRONT (PARK)
190 PK FUSE TO PARK BRAKE SW. 501 GN WIPER - FRONT (LOW)
199 OR FUSE TO RETARDER SW. 502 OR WIPER - FRONT (HIGH)
GROUND CIRCUITS 506 PU WASHER-FRONT
200 BK MAIN CHASSIS 513 OR AIR CONDITIONER COMPRESSOR
201 BK OPERATOR MONITOR PANEL 515 GY BLOWER MOTOR (HIGH)
203 BK CHASSIS DIAGNOSTIC 516 GN BLOWER MOTOR (MEDIUM)
207 BK STARTER DIAGNOSTIC 517 BU BLOWER MOTOR (LOW)
297 BK BODY HOIST CONTROL 521 YL AIR CONDITIONER SW. TO
MACHINE BASIC CIRCUITS REFRIGERANT SW.
301 BU STARTER NO.1 SOL. TO RESISTOR 522 WH AIR CONDITIONER COMPRESSOR TO
302 OR STARTER NO.1 TO DIAGNOSTIC/ THERMOSTAT SW.
RESISTOR TO DIAGNOSTIC 537 GN TURN SIGNAL SW TO FLASHER
304 WH STARTER RELAY TO NO.1 OUTPUT 539 BU TURN SIGNAL INDICATOR BASIC/
306 GN START RELAY TO NEUTRAL RIGHT
STARTSW.
540
WH TURN SIGNAL INDICATOR BASIC/
307 OR KEY START SW. TO NEUTRAL LEFT
STARTSW.
LIGHTING CIRCUITS
308 YL MAIN POWER RELAY COIL 602 WH DOME LAMP
310 PU START AID SW. TO START AID SOL. 604 OR STOP LAMP
311 WH START AID SOL. TO TEMP SW. 605 YL TURN LAMP - LEFT
321 BR BACK UP ALARM/LAMP 606 GY TURN LAMP - RIGHT
322 GY WARNING HORN (FORWARD) 610 OR HEAD LAMP BASIC
326 PU KEY SWITCH "C" TERMINAL 611 PU HEAD LAMP HIGH
327 PK SHUT DOWN SOL. 614 PU PARK/TAIL/DASH LAMP
MONITORING CIRCUITS 619 GN HEAD LAMP - LOW
403 GN ALTERNATOR (R) TERMINAL 624 YL WORK LAMP
405 GY OPERATOR MON PANEL OIL PRESS.
CONTROL CIRCUITS
406 PU OPERATOR MON PANEL COOLANT 706 BR TRANSMISSION RETARDER SW.
TEMPERATURE A790 WH SUSPENSION INHIBIT SW.
407 PK OPERATOR MON PANEL CONVERTER/ A791 OR DOWN SOL. - FRONT SUSPENSION
RETARDER OIL TEMPERATURE A792 BU UP SOL. - FRONT SUSPENSION
409 OR OPERATOR MON PANEL NEUTRAL A958 WH PARK BRAKE SOL.
410 WH OPERATOR MON PANEL FAULT B761 YL BODY RAISE SOL.
ALARM B762 GN BODY LOWER SOL.
411 PK OPERATOR MON PANEL MASTER
FAULT LAMP
413 BR OPERATOR MON. PANEL FUEL
PRESSURE
Circuit Number Chart
Component Locations
CHG
3
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
3
200-BK
610-OR-14
L10
L10
160-BUBODY HOIST CONTROL
H
H
H
H
H
H
H
H
H
F-1000105-5127
00 D-12U-8871
EE
DD
EE
1
EE
A487-PU
EE DD
2
BK
RD
DD
410-WH
A487-PU
410-WH
410-WH
2
1
AUX
SOUNDER
2U-8863
002U-8190
00
C-1
C-1
417-GY
CC
BB
CC
CC
CC
2
3
200-BK
M
M
L41
L43
200-BK
307-OR
374-PK
374-PK
L43
374-PK
L43
L43
L43
L43
M
M
200-BK
B765-BR
B765-BR
M
M
B765-BR
B765-BR
B765-BR
PARK
BRAKE
RELAY
3T-2170
201-BK
BU
3
2
1
RD
BK
B765-BR 190-PK
M
HARNESS AS.
LOCPART NO.IDENT
6
5
200-BK
200-BK200-BK-14
200-BK-14
W
1
2
L10
1
3
PARK BRAKE
FUEL LEVEL
FUEL PR
CONV TEMP
ENG OILPR
COOLTEMP
ALTERNATOR
NEUTRAL
BRAKE OIL
+BATTERY
LAMP
TEST SWITCH
ALARM
GROUND
1
5
2
3
4
2
6
2
3
2
190-PK
3
2
1
BK-18
5
4
1
P
103-YL
103-YL
200-BK
RD-18
WH-18
200-BK
A-6
307-OR
374-PK
321-BR
200-BK
BODY HOIST
SW 7U-6554
RD
GY
GN
BK
YL
WHWH
YL
BK
GN
DOWN DIRECT
103-YL-14
DOWN
UP DIRECT
UP
GY
RD
INHIBIT
SUPPLY
2
3
1
6
5
4
BK
RD
1
2
2U-8171
10
00
M
M
322-GY
611-PU-14
619-GN-14
619-GN-14
614-PU 614-PU
N9X-4716 01 B-6
200-BK-14200-BK-14
N
N
N
N
N
N
RESISTOR
9G-1950
BLOWER
9G-8697
WH/RD-14
2
1
BK-14
WH/RD-14
1
2
MOTOR
BK-14
MOTOR
BLOWER
9G-8693
200-BK-14
200-BK-14
G
G
K
K
1
A-500
U
M
M
7U-5670
AUX START
RECEPTACLE
M
M
V
M
PARKBRAKE SW
102-9371
M
7U-8985
CABLE AS.
S
00 A-5
WIRE AS.
A-4
04
01
01
00
03
027U-9812
01102-2287
032U-6303
+BATTERY
GROUND
UP SOLENOID
DOWN SOLENOID
1
201-BK
STEERING
PRESSURE SW
8T-8640
SUPPLEMENTAL
STEERING
PRESSURE SW
8T-8640
5
B740-PU
4
3
M
B
BB
B
M
M
B
M
M
L5
123-WH
490-GN
M
498-WH
L7
L6
200-BK
FRAME
GROUND
A958-WH
614-PU
S
Q
L7
L6
12V BATTERY
9G-4232
12V BATTERY
9G-4232
BK-00
BK-00BK-00
NEGPOSNEGPOS
2
A958-WH
200-BK
614-PU
614-PU
614-PU
007U-5418U
RESISTOR
6T-2217
614-PU
614-PU
M
M
M
A-5
614-PU
017U-3629
614-PU
T
1
2
3
1
M
L42
490-GN
2
3
DISCONNECT SW
7N-0718
F-1
B-2
B-3
E-3
C-7
B-12
B-2
A-2
B-3
C-4
03
00
L42
L42
L42
2U-6301
7U-9813
7U-9075
2U-6302
2U-6446
7U-6749
7U-9811
M
K
490-GN
498-WH
M
L41
M
M
A-500
M
L42
L42
L42
419-YL
454-GN
7U-9551
611-PU-14
R
2
L41
L40
L40
L40
2
3
1
4
L40
2
BK
RD
BU
OPERATOR STATION
449-BU
451-BR
450-YL
403-GN
403-GN
M
4
STEER W/L
M
L40
L39
P
P
3BU
L39
WH
BK
K
C
K
G
200-BK
200-BK
200-BK
D
D
D
200-BK
E
614-PU
200-BK-14
619-GN-14
E
E
E
E
200-BK
200-BK
200-BK
200-BK-14
200-BK-14
611-PU-14
417-GY
A-607
M
H
9F-4337
201-BK
AA
AA
LOW
HYDRAULIC
OIL PRESSURE SW
2U-8873
4
5
201-BK
201-BK
201-BK
432-PK
201-BK
201-BK
406-PU
614-P
U
614-PU
2
1
L39
BU-18
RD-18
L39
BU
3
RH LOW BEAM
HEAD LAMP
9X-1441
OPERATOR STATION
OPERATOR STATION
L39
L38
L38L38
L38
L38
H
2
200-BK 200-BK-14
FLOOD
LAMP
9X-1439
606-GY
200-BK-14
200-BK
200-BK
B
X
610-OR-14
A-12
PARK
BRAKESW
102-3648
5
454-GN
4
00
B
200-BK
W
605-YL
606-GY
B
200-BK
307-OR
449-BU
477-YL
SPEEDOMETER
SPEED PICKUP
9X-5393
NOTE C
2
200-BK
604-OR
H
L39
200-BK
DIFF
LOCK SW
3T-3133
310-PU
L38
614-PU
604-OR
F
L38
F
201-BK
H
409-OR
H
2
1
STARTER
3T-4586
C
112-PU-14
FRONT
SUSPENSION
CONTROL
7U-6062
BK-00
C
112-PU-14
432-PK
B
125-OR
A790-WH
A792-BU
A791-OR
WH-18
OR-18
WH-18
BU-18
FRONTSUSPENSION
SOLENOID
7U-6964
BK-00
201-BK
GS
MTR BAT
MOTOR
409-OR
321-BR
200-BK
297-BK
121-YL
B
6
L38
L38
2
L9
H
A958-WH
449-BU
477-YL
606-GY
605-YL
490-GN
5
297-BK
306-GN
307-OR
306-GN
3
C
200-BK
C
C
JJ
J
J
C
112-PU-10
A792-BU
A790-WH
A791-OR
A790-WH
L38
5
L38
L38
310-PU
310-PU
L35
L7
L7
L34
L33
L15
L1
L25 L25
L25 L25
9
L24
L37
L37
NOTE: WIRE 417-GY
IS CONNECTED
TO HARNESS AS.
BB.
2
6
A
B
C
D
10
8
L37
7
8
L37
L37
1
L24
L5
L5
L24
L24
L24
L1
L1
L30
L29
1
YY
L29
L29
L4
L4
L4
L5
L5
L5
L2
L2
L2
L2
L2
F
L14
L14
L14
L6
L7
L6
L7
L17
L17
L18
L18
L16
L17
L23
L23
L19
L18L18
L18
L14
L15
419-YL
200-BK-14
L7
413-BR
406-PU
H
BU-18
RD-18
BK-18
L15
L35
L25
L25
L25
L25
L26
L26
L26 L26
L30
L33
L33
L16
L16
L15
L33
L31
L30
L27
L27
L27
L27
L28
L28
L21
L21
L19
L19
L19
L20
L20
J
443-YL
A958-WH
449-BU
450-YL
451-BR
407-PK
413-BR
406-PU
405-GY
3
4
L11
C
2
A487-PU
1
1
419-YL
OPERATOR STATION
J
506-PU
443-YL
469-GN
419-YL
477-YL
498-WH
490-GN
606-GY
7
605-YL
6
L11
H
M
4
1
417-GY
201-BK
201-BK
201-BK
201-BK
201-BK
410-WH
415-GN
411-PK
113-OR
432-PK
409-OR
403-GN
406-PU
405-GY
407-PK
413-BR
469-GN
H
419-YL
327-PK
5
9
1
2
3
C
515-GY-14
515-GY-14
454-GN
4
3
2
6
J
A790-WH
604-OR
321-BR
522-WH-14
521-YL-14
619-GN-14
5
L11
7
1
L11
L12
L12
L12
611-PU-14
L12
3
307-OR 306-GN
CONVERTER
TEMPSW
7N-7854
J
403-GN
302-OR
302-OR
403-GN
207-BK
203-BK
SUSPENSION
INHIBIT SW
7U-9039
311-WH
322-GY
614-PU
310-PU
311-WH
302-OR
203-BK
207-BK
322-GY
614-PU
310-PU
403-GN
A790-WH
A790-WH
201-BK
201-BK
201-BK
J
200-BK-14
J
304-WH-10
101-RD-6
L12
J
J
L8
L8
L7
L10
321-BR
304-WH-10
611-PU-14
610-OR-14
A790-WH
A790-WH
BU-18
RD-18
BK-18
321-BR
200-BK-14
C
506-PU
C
L23
A958-WH
200-BK-14
407-PK
201-BK
443-YL
611-PU-14
443-Y
L
201-BK
407-PK
L10
L6
114-GN
125-OR
173-YL
123-WH
113-OR
165-YL
HORN
BACKUP ALARM
SUSPENSION CONTROL
CABLAMP
BB
C
311-WH
619-GN-14
DIAGNOSTIC
CONNECTOR
407-PK
C
C
311-WH
310-PU
4
20
102-BU-14
19
18
17
3
16
15
14
2
13
10
9
114-GN
200-BK-14
322-GY
4
1
614-PU
610-OR-14
5
500-BR
506-PU
4
118-GY
521-YL-14
7
513-OR-14
C
614-PU
3
506-PU
2
L6
L6
11
GAGES
619-GN-14
611-PU-14
539-BU
540-WH
310-PU
2
121-YL
6
OPERATORMONITOR
101-RD
101-RD
112-PU-14
112-PU
112-PU
112-PU-14
START AID
4
311-WH
302-OR
203-BK
207-BK
304-WH
105-BR
308-YL
112-PU
306-GN
109-OR
310-PU
101-RD
3
5
1
7
ALTERNATOR
BREAKER
9S-0174
109-OR
109-OR-10
109-OR-6
101-RD-6
101-RD
101-RD-14
101-RD-14
101-RD-14
105-BR
105-BR
KEY BREAKER
9G-9487
START
RELAY
9F-3099
C
200-BK
304-WH
304-WH-10109-OR-10
FRONT
WIPERSW
3T-6655
RUNNING
LAMP SW
8C-9636
HORN SW
3T-2357
CAB
LAMPSW
6T-3990
10
10
10
10
10
10112-PU-14
10
C
C
C
C
J
RETARDER SW
9X-4276
C
C
203-BK
201-BK
200-BK-14
201-BK
201-BK
200-BK-14
201-BK
201-BK
M
B
WP
L
H
B
207-BK
200-BK-14
200-BK-14
201-BK
L34
H
H
H
M
M
M
405-G
Y
200-BK-14
200-BK-14
L34
L22
L8
L8
200-BK
201-BK
200-BK
L21
469-GN
200-BK
200-BK
HORN
HIGH TONE
7T-0970
HORN
LOWTONE
7T-0969
200-BK
201-BK
201-BK
200-BK
200-BK-14
201-BK
321-BR
BREAKER
PANEL
GROUND
FRONT WIPER
MOTOR
3E-5147
J
200-BK-14
200-BK
200-BK
200-BK
454-GN
L8
A790-WH
C
CJ
J
L28
H
H
L29
L29
L29
L14
L14
L22
L31
L31 L31
L31
501-GN
118-GY
500-BR
502-OR
L32
CAB LAMP
9X-1439
L32
L32
L32
L22
L10
H
L13
L13
L13
H
F
H
537-GN
L20
3
6
321-BR
121-YL
121-YL
5
2
327-PK
109-OR-6
200-BK
160-PU
490-GN
A790-WH
200-BK
165-YL
173-YL
200-BK
624-YL
454-GN
200-BK-14
200-BK
101-RD
2
4
3
5
T
311-WH
P
3
1
7U-7702W
B-12
498-WH
1
321-BR
604-O
R
A
5
00P
P
P
P
200-BK
200-BK
103-YL
DOME LAMP
8C-9678
DOME LAMP
SW 9D-4068
NOTEB
602-WH
602-WH 103-YL
RD-00
00
411-PK
415-GN
308-YL
308-YL
H
1
BH
G
G
125-OR
A790-WH
A792-BU
A791-OR
G
G
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
DESCRIPTIONSYMBOL
CONNECTOR
ELECTRICAL CONNECTION
TO VEHICLESTRUCTURE
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
BLADE, SPADE, RING,
OR SCREW TERMINAL
BK
PK
YL
OR
WH
RD
GN
BU
GREEN
BLUE
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ATCH WIRE, CABLE,
COMPONENT
L
200-BK
NEUTRAL
STARTSW
8T-8653
2
#
CIRCUIT GROUPING
DESIGNATION
JH
125-OR
327-PK
201-BK
200-BK-14
B762-GN
B761-YL
200-BK
200-BK
Z
A-2012U-9315Z
F-12007U-5994
201-BK
L3
L3
112-PU
112-PU-10
308-YL
Y
200-BK
L3
1
MAIN POWER
RELAY
3T-0376
502-OR
501-GN
2
PARK
BRAKE
SOLENOID
2U-6512
BODY LOWER
2U-7294
BODY RAISE
2U-7294
BODY HOIST
SOLENOIDS
7
118-GY
190-PK
199-OR
130-GN
160-BU
WASH/WIPE
PARKBRAKE
RETARDER
INDICATOR LAMPS
BODY HOIST CONTROL
B762-GN
200-BK
B761-YL
124-GN-14
101-RD-14
101-RD
101-RD-14
101-RD-14
101-RD-14
101-RD-14
103-YL
102-BU-14
107-WH-14
AIR CONDITIONER
BREAKER
6N-8589
RUN LAMPS
BREAKER
9G-9487
HEADLAMP
BREAKER
6N-8589
ENGINE
SHUTDOWN BREAKER
6N-8589
200-BK
1
3
4
NOTE: WIRE 410-WHON HARNESS AS. DD
IS SPLICED INTO HARNESS AS. M.
7
AIRPRESSURE
INDICATOR
1W-3306
614-PU
200-BK
J
J
123-WH
200-BK
200-BK-14
297-BK
201-BK
124-GN-14
121-YL
173-YL
8
5
449-BU
477-YL
6
3
1
2
130-GN
LAMP
2U-4806
LAMP
2U-4806
LAMP
2U-4806
H
FUSES
10A- 3K-8782
FUSE HOLDERS
4K-5122
112-PU
112-PU
L9
112-PU-14
4
P
614-PU200-BK
123-WH
614-PU200-BK
123-WH
200-BK
200-BK
306-GN
SPEEDOMETER
8C-9807
TACHOMETER
8C-9839
SERVICE HOUR
METER
6T-7337
118-GYWASH/WIPE
200-BK
A790-WH
506-PU
200-BK
RIGHTTURN
LAMP
2U-4791
BASE
2G-0151
RETARDER
LAMP
2U-4791
BASE
2G-0151
HI BEAM
INDICATOR
LAMP
2U-4791
BASE
2G-0151
DIFFERENTIAL
LOCK LAMP
2U-4791
BASE
2G-0151
TORQUE
CONVERTER LOCK
LAMP
2U-4791
BASE
2G-0151
409-OR
308-YL
306-GN
306-GN
306-GN
130-GN
190-PK
6
12
454-GN
306-GN
9
306-GN
200-BK
113-OR
101-RD
173-YL
123-WH
301-BU
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
DESCRIPTION
L5
SYMBOL
CONNECTOR
ELECTRICAL CONNECTION
TO VEHICLESTRUCTURE
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
101-RD-6
200-BK-14
LEFT TURN
LAMP
2U-4791
BASE
2G-0151
10A
10A
10A
10A
10A
15A
BLADE, SPADE, RING,
OR SCREW TERMINAL
15A
10A
15A
-
+24
1
-
+24
H
130-GN
454-GN
200-BK-14
130-GN
539-BU
611-PU-14
498-WH
539-BU
200-BK
540-WH
109-OR-6
109-OR-6
M
BK-18
105-BR
BK-6
105-BR
103-YL
540-WH
RD-00
H
1
4
2
3
201-BK
410-WH
326-PU
LOCK UP
PRESSURE SW
9X-4276
109-OR-6
J
103-YL-14
2
4
BK
490-GN
FAULT
ALARM
9G-9813
PK
H
L34
YL
604-OR
7U-6764
200-BK
OR
RD-00
WH
624-YL
H
201-BK
415-GN
411-PK
502-OR
500-BR
118-GY
RD
GN
302-OR
501-GN
2
10
9
6
4
BU
200-BK
200-BK
200-BK
L40
200-BK-14
GREEN
RD
BK
410-WH
201-BK
1
BLUE
5
8
604-O
R
321-BR
1
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ATCH WIRE, CABLE,
COMPONENT
THERMOSTAT
3E-5464
4
200-BK-14
F
A
L #
5
H
3
4
J
H
2
H
1
2
1
L40
200-BK
200-BK
200-BK
200-BK
CIRCUIT GROUPING
DESIGNATION
T
4
1
3
C
200-BK-14
C
200-BK
540-WH
200-BK
539-BU
619-GN-14
539-BU
200-BK-14
112-PU-14
327-PK
200-BK-14
165-YL
113-OR
105-BR
308-YL
7
327-PK
123-WH
200-BK-14
165-YL
113-OR
105-BR
308-YL
130-GN
M
M
M
H
H
H
M
M
M
M
M
614-PU
H
M
M
H
H
H
H
H
D-6
3
200-BK
200-BK-14
403-GN
310-PU
614-PU
322-GY
207-BK
203-BK
302-OR
H
101-RD-6
304-WH-10
6
H
7
611-PU-14
201-BK
469-GN
311-WH
200-BK
2
1
2
1
2
1
FUEL
LEVEL SW
3E-1942
COOLANTTEMP
SW-ETHER INHIBIT
7X-5988
COOLANT
TEMPSW
7N-9785
T T
5
L38
4
C
J
3
8
614-PU
MASTER
FAULTLAMP
7N-1996
BASE
3T-0304
OPERATOR
MONITOR TEST SW
6T-6066
CONVERTER
TEMP GAGE
4W-2066
START
AIDSW
6T-6066
310-PU
201-BK
201-BK
415-GN
200-BK
124-GN-14
411-PK
200-BK-14
521-YL-14
515-GY-14
A958-WH
522-WH-14
311-WH
522-WH-14
130-GN
190-PK
BLOWER SW
6P-3236
M
515-GY-14
112-PU-14
5
KEY
START SW
9G-7641
TURN
SIGNAL SW
9G-5589
BK
BK
3
BK-18
521-YL-14
308-YL
326-PU
307-OR
105-BR
OPERATOR
MONITOR
PANEL
9X-9864
124-GN-14
B
200-BK-14
517-BU-14
516-GN-14
2
515-GY-14
200-BK
J
200-BK-14
H
200-BK
537-GN
103-YL-14
103-YL-14
1
M
M
M
M
M
605-YL
606-GY
540-WH
540-WH
539-BU
539-BU
517-BU-14
M
415-GN
DASH
PANEL
GROUND
200-BK
M
201-BK
411-PK
YL-18
WH-18
BK-18
BU-18
RD-18
OR-187
614-PU
614-PU
4
322-GY
619-GN-14
411-PK
502-OR
200-BK-14
500-BR
SIG
M
410-WH
10A
501-GN
624-YL
160-BU
160-BU
B762-GN
B761-YL
1
3
2
6
5306-GN
326-PU
200-BK
327-PK
107-WH-14 + BATTERY
GROUND
ENG SOL
RESET
OFF(KEY)
OFF
M
L41
60A
201-BK
200-BK-14
M
M
STOPLAMP
498-WH
173-YL
103-YL
14
5
6
2
3
RD
BK
NOTE
BACK UP
LAMP
9X-1439
M
200-BK-14
ST
ON
200-BK
OFF
200-BK
B
S
C
200-BK
R
165-YL
130-GN
3
102-BU-14
BB
BACK UP
ALARM
3T-1815
2
443-YL
200-BK-14
506-PU
321-BR
7U-8986
321-BR
200-BK
CONVERTER
TEMPSENDER
6N-5926
614-PU
604-OR
304-WH
614-PU
103-YL
604-OR
FRONT
WASHER MOTOR
2U-4570
605-YL
4
LH STOP/TAIL/TURN
LAMP
6U-4358
U
RH STOP/TAIL/TURN
LAMP
6U-4358
MOTOR
7
2
310-PU
311-WH
START AID
SOLENOID
9G-4365
5
199-OR
NOTEC
199-OR
BACK UP
ALARM SW
3T-3132
321-BR
121-YL
3
1
6
8
308-YL
105-BR
103-YL-14
112-PU
114-GN
123-WH
173-YL
113-OR
118-G
Y
101-RD
6
619-GN-14
611-PU-14
7U-7921
WH-18
604-OR
173-YL
BK-18
201-BK
DIMMER SW
2H-1855
190-PK
AA
J
H
G
F
AA
C-2/E-1100
BK
BK-18
RD-18
BU-18
306-GN
8
201-BK
E
D
C
B
415-GN
STOP LAMPSW
7U-9036
GND
521-YL-14
513-OR-14
REFRIGERANT
SWITCH
5V-5698
NOTEA
A/CCLUTCH
SOLENOID
8T-8813
522-WH-14
513-OR-14
L4
L4
165-YL
H
LH LOW BEAM
HEAD LAMP
9X-1441
RH HIGH BEAM
HEAD LAMP
9X-1440
RH PARK-TURN
LAMP
2U-4432
-+
121-YL
123-WH
123-WH
J
L16
B
2
1
4
OPERATOR STATION
3
2
4
1
409-PK
B+
P
2
1
1
8
624-YL
173-YL
MMM
M
M
M
200-BK
L7
M
207-BK
407-PK
C
443-YL
614-PU
123-WH
130-GN
BK-18
BK-18
200-BK
BK-18
1
3
2
1
203-BK
5
327-PK-14
200-BK-14
450-YL
451-BR
7
413-BR
201-BK
2
TACHOMETER
ENGINE SPEED
PICK UP
9X-8167
ENGINE OIL
PRESSURESW
9X-4276
109-OR-6
ENGINE
SHUTDOWN
SOLENOID
6T-4122
FUEL
PRESSSW
9W-3187
ALTERNATOR
5N-5692
M
105-BR
200-BK-14
H
308-YL
190-PK
109-OR
624-YL
411-PK
522-WH-14
521-YL-14
200-BK-14
327-PK-14
322-GY
450-YL
451-BR
311-WH
207-BK
203-BK
302-OR
403-GN
201-BK
413-BR
406-PU
469-GN
405-GY
415-GN
502-OR
2U-7045
501-GN
5
3
4
ENGINE SHUTDOWN
CONTROL
9G-9287
FLASHER
8D-6946
FRAME
GROUND
2
OPERATOR
STATIO
N
6
7
500-BR
BK-6
200-BK
322-GY
322-GY
200-BK
9
8
103-YL-14
619-GN-14
130-GN
1
BODY HOIST CONTROL
SW
2U-6683
Q
SIG
200-BK-14
AA
405-GY
201-BK
ALT
+
R
B
S
TT
RD-00
R
Q
R
X
GN
GY
BR
OR
4
2
3
1
H
L
MOTOR
611-PU-14
200-BK-14
V
R
BK-00
TO ENG
BLOCK
TO
FRAME
IGN
SEND
GRD
19
14
13
7
5
6
3
9
8
1
11
15
10
2
4
16
12
18
17
20
1
2
3
3
9
2
6
7
5
4
8
1
4
6
5
7
L9
L9
2
3
8
B
1
506-PU
9
10
2
T
INHIBIT
SUPPLY
6
614-PU
614-PU
606-GY
605-YL
LOWER
RAISE
WH
BK
624-YL
200-BK
201-BK
L35
L35
327-PK
114-GN
L20
611-PU-14
M
GN
YL
611-PU-14
706-BR
403-GN
109-OR-6
4
A
COMPONENTS ARE SHOWN INSTALLED ONAFULLY
OPERABLE MACHINE WITH THE KEY AND ENGINEOFF, THE XMSN SHIFTER
IN NEUTRAL, AND THE PARK BRAKE SW IN THE OFF POSITION.
UNLESS OTHERWISE SPECIFIED: ALLWIREIS16 GAGE
NOTE A: NORMALLY OPEN BEFORE REFRIGERANT CHARGE
NOTE B: NORMALLY CLOSED WHEN DOOROPEN
NOTE C: WIRE TIED BACK IN HARNESS
THIS SCHEMATICISFOR THE D300D ARTICULATED
TRUCK (3E-7568 CHG 01)
J
H
C
540-WH
611-PU-14
LH PARK-TURN
LAMP
2U-4432
3
2
M
E
D
LH HIGH BEAM
HEAD LAMP
9X-1440
1
9 8 7 6 5 4 3 2 112 11 10
12
11
10
9 8 7 6 5 4 3 2 1
F
E
D
C
B
A
F
E
D
C
B
A
D36796
