Connector Location¹
Wire Color
Bat(+)
504
YL
Wiper - Rear (Low)
BU
Hd Lmp
505
BU
Wiper - Rear (HI)
22
103
RD
Aux Ckt
506
PU
Washer - Front
RD
Key Start Sw
507
WH
Washer - Rear
Machine Location
CONN 1
C-15
26
CONN 2
E-15
26
CONN 3
F-14
31
CONN 4
F-14
Wire Color
101
RD
102
Wire Description Wire Number
Schematic Location
Connector Number
Wire Number
Description Power Circuits
Accessory Circuits (Continued)
CONN 5
A-14
22
105
CONN 6
A-14
5
108
BU
Aux Ckt
515
GY
Blower Motor (HI)
CONN 7
B-13
30
109
OR
Alt Output (+) Term.
516
GN
Blower Motor (Medium)
CONN 8
B-13
29
CONN 9
D-13
29
113
RD
Opr Mon Panel
517
BU
Blower Motor (Low)
CONN 10
E-12
29
114
RD
Warning Horn (Forward)
521
YL
A/C SW To Refrigerant SW
CONN 11
E-12
29
116
RD
AuxCkt
522
WH
A/C Clutch To Thermostat SW
CONN 12
E-12
25
118
GY
AuxCkt
556
WH
Differential Lock
CONN 13
E-12
C
119
PK
AuxCkt
575
YL
Wiper - Aux (Park)
CONN 14
D-12
B
124
RD
A/C
576
PK
Wiper - Aux (Low)
CONN 15
D-12
23
126
PK
Xmsn CtrI
577
PU
Wiper - Aux (HI)
129
BU
Aux Ckt
578
BU
Washer - Aux
130
RD
AuxCkt
584
YL
Wiper SW Jumper
135
BU
Aux Ckt
A503
PK
Front Defroster Fan (Low)
141
PK
Aux Ckt
A504
GN
Rear Defroster Fan (Low)
144
GN
AuxCkt
A506
OR
Front Defroster Fan (HI)
149
RD
AuxCkt
A507
YL
Rear Defroster Fan (HI)
151
GN
AuxCkt
152
BU
Aux Ckt
603
PK
Rotary Beacon
165
RD
Aux Ckt
604
OR
Stop Lamp
608
GN
Flood Lamp - Rear
CONN 16
B-12
3
A-11
10
CONN 18
D-10
10
CONN 19 Service Tool
B-9
C
CONN 20
E-9
25
CONN 21
E-9
25
CONN 22
A-8
23
CONN 23
B-7
10
CONN 24
B-7
10
CONN 25
E-6
24
CONN 26
E-6
24
CONN 27
C-6
24
CONN 28
C-6
24
CONN 29
C-6
27
CONN 30
A-6
27
CONN 31
C-5
27
CONN 32
C-5
27
CONN 33
B-3
15
CONN 34
E-3
23
CONN 35
F-3
23
CONN 36
F-3
23
CONN 37
E-9
B
¹ The connectors shown in this chart are for harness to harness connectors. Connectors that join a harness to a component are generally located at or near the component. See the Component Location Chart.
31
18 14
23
CONN 17
8
6 26 13
11
22
1 5
30
D
20
29
9
B
E
12 2
21
7
17
23
32
25
4
19
24
C
28
A
27
16 15
10
Lighting Circuits
Ground Circuits
27
D
22 30
18
B
11 C
12
6
14 26
31
23 8
5
1
2
28
4 3 29
20
25
A 9 24
E
13
200
BK
Main Chassis
609
YL
Flood Lamp - Side
202
BK
XMSN CtrI
611
PU
Head Lamp Hi
276
BK
XMSN CtrI dent Code 0
614
PU
Park/Tail/Dash/Lamp
277
BK
XMSN Ctrl dent Code 1
619
GN
Head Lamp Lo
278
BK
XMSN Ctrl dent Code 2 710
GN
XMSN Speed Pickup Signal
15 19
16
10 21
7 17
301
BU
Starter No. 1 Sol
751
GN
XMSN Shift Sol No. 1 Or 3
304
WH
Starter Relay No. 1 Output
752
YL
XMSN Shift Sol No. 2
754
BU
XMSN Shift Sol No. 3 Or 1
755
OR
XMSN Shift Sol No. 4 Or 5
F775
BU
Centershift Solenoid
795
YL
Dual Hp Sol
F843
YL
Inching Pedal
306
GN
307
OR
Starter Relay Coil To Neut Start SW Or Key Start SW Key Start SW To Neutral Start SW
308
YL
Main Power Relay Coil
310
PU
Start Aid SW To Start Aid Sol
311
WH
Start Aid Sot To Temp SW
321
BR
Backup Alarm Lamp Travel Alarm
892
BR
Start Mod Right (-) Port/CAT Data Link (-)
322
GY
Warning Horn (Forward)
893
GN
Start Mod Right (+) Port/CAT Data Link (+)
326
PU
Key Start SW "C" Term.
900
PU
XMSN Shift Sol No. 5 or 4
901
WH
XMSN Shift Sol No. 6
Monitoring Circuits
E50118
Machine Harness Connector And Component Locations
12H, 140H, And 160H Motor Graders Standard Version Electrical System
Control Circuits
Basic Machine Circuits
32
SENR9149-01 April 1998
Description
12H: 4ER500-UP
403
GN
Alternator (R) Term.
902
BR
XMSN Shift Sol No. 7
439
YL
Lamp Indicator
903
GY
XMSN Shift Sol No. 8
441
OR
Eng Coolant Temp Gauge
M917
PK
TOS Sensor
498
WH
Diff Lock Indicator
M918
ON
TOS Sensor
A429
YL
Articulation Indicator
921
WH
XMSN Sol No 1 Or 3 Return
A476
PU
Eng Oil Press Gauge To Sender - Eng #1
E937
PU
MG MESH CNTL - Redundant Neutral
B476
BU
(NFND) Transmission Indicator Lamp
E938
OR
MG MESH CNTL - First Gear
C491
PU
Park Brake Pressure
E939
WH
MG MESH CNTL - Second Gear
E458
YL
Low Air Pressure Lamp
E940
BU
MG MESH CNTL - Third Gear
E459
WH
Low AIr Pressure Alarm
E941
YL
MG MESH CNTL - Fourth Gear
E460
BR
Trans CntI To Relay Coil
E942
GN
MG MESH CNTL - Fifth Gear
F473
YL
Transmission Warning
E943
BR
MG MESH CNTL - Sixth Gear
G460
GN
Transmission Temperature
E944
GY
MG MESH CNTL - Seventh Gear
E945
PU
MG MESH CNTL - Eighth Gear
Accessory Circuits 500
BR
Wiper - Front (Park)
E946
OR
MG MESH CNTL - Forward Direct
501
GN
Wiper - Front (Low)
E947
WH
MG MESH CNTL - Reverse Direct
502
OR
Wiper - Front (HI)
E948
BU
MG MESH CNTL - Park
503
BR
Wiper - Rear (Park)
E949
YL
MG MESH CNTL - Neutral
E975
PU
MESH Lamp
M998
OR
Transmission Autoshift Mode
140H: 8JM280-UP 5HM1150-UP
160H: 9JM350-UP 2FM400-UP
Printed in U.S.A.
© 1998 Caterpillar All Rights Reserved
Harness And Wire Electrical Schematic Symbols Transmission Diagnostic Code Conversion
Flash Code
CID - FMI
11
N/A
No diagnostics active
12
N/A
No logged diagnostic codes
Component
Description 12V Power Port
Schematic Location F-9
Component Location Machine Location 32
Component Sender - Articulation
Schematic Location C-12
Machine Location 7
24 to 12 volt converter
F-13
8
Sender - Engine Coolant Temperature
B-14
11
Alarm-Action
B-9
C
Sender-Engine Oil Pressure
B-13
13
Alarm - Backup
F-15
1
Sender- Transmission Speed
D-15
14
Alternator
D-14
2
Solenoid-Centershift
B-3
16
Arc Suppressor
E-14
17
Solenoid - Differential Unlock
E-14
17
Battery
C-14
3
Solenoid-Dual Horsepower
A-13
5
Battery
C-14
4
Solenoid - Engine Shutdown
D-13
5
Breaker - Alternator
D-13
5
Solenoid - Forward Horn
A-3
16
Breaker - Headlamp
D-10
B
Solenoid - Park Brake
B-12
16
Control - Neutral Start
B-9
10
Solenoid - Start Aid
A-13
18
A-7
E
Solenoids - Transmission Valves
E-15
14
A-9
C
Switch - Beacon
B-6
C
B-6
C
Switch - Blower (Heater Group)
A-10
C
D-9
B
Switch - Brake Air Pressure
A-2
Resistor, Sender and Solenoid Specifications
Part No.
Component Description
3E-5383
7T-4003
Resistor - Defroster
10.0 ± 0.5
7T-9073
Solenoid - Differential Unlock
33.6 ± 1.0
7T-9074
Solenoid - Forward HornPark Brake
8C-3663
Solenoid - Engine Shutdown Latch: Unlatch:
8T-8808
Solenoid - Centershift
34.3 ± 1.7
9G-1950
Resistor-Blower Speed
Overall 2.00 ± .10 Tap 1.00 ± .05
9G-4365
Solenoid - Start Aid
16
104-6387
Sender - Transmission Speed
111-0570
Solenoid-Dual HP
116-9937
Sender - Engine Oil Pressure
127-0574
Solenoid - Transmission
641
F05 Transmission Solenoid A open circuit
642
F05 Transmission Solenoid B open circuit
23
643
F05 Transmission Solenoid C open circuit
24
644
F05 Transmission Solenoid D open circuit
25
645
F05 Transmission Solenoid E open circuit
26
646
F05 Transmission Solenoid F open circuit
27
647
F05 Transmission Solenoid G open circuit
28
648
F05 Transmission Solenoid H open circuit
31
641
F06 Transmission Solenoid A short to ground
32
642
F06 Transmission Solenoid B short to ground
33
643
F06 Transmission Solenoid C short to ground
34
644
F06 Transmission Solenoid D short to ground
Control - Transmission Control - Transmission Direction and Speed SW Fuses (10A)
35
645
F06 Transmission Solenoid E short to ground
Fuses Block
36
646
F06 Transmission Solenoid F short to ground
Gauge - Cluster
F-5
A
Switch - Centershift Indicator
B-3
19
37
647
F06 Transmission Solenoid G short to ground
Ground - Engine
C-13
12
Switch - Centershift Pin
B-9
C
38
648
F06 Transmission Solenoid H short to ground
Ground - Frame Cab
D5,6
24
Switch - Coolant Temp (Start Aid)
A-14
11
41
641
F03 Transmission Solenoid A short to battery
Ground - Front Frame
D-6
21
Switch - Defrost, Front
A-6
C
42
642
F03 Transmission Solenoid B short to battery
Ground - Front,Rear Frame
B-12
20
Switch - Defrost, Rear
B-6
C
43
643
F03 Transmission Solenoid C short to battery
Ground - Rear Frame
C-13
28
Switch - Differential Unlock
D-9
B
44
644
F03 Transmission Solenoid D short to battery
Horn - Forward
F-3
16
Switch - Disconnect
C-14
13
45
645
F03 Transmission Solenoid E short to battery
Meter - Service
E-10
B
Switch - Flood Lamp
D-8
B
46
646
F03 Transmission Solenoid F short to battery
Motor - Blower
E-4
E
Switch - Forward Horn
E-9
B
47
647
F03 Transmission Solenoid G short to battery
Motor - Blower (Heater Group)
A-10
E
Switch - Fuel Pressure
B-13
13
48
648
F03 Transmission Solenoid H short to battery
Motor - Blower, Defroster
A-11
E
Switch - Head/Tail Lamp
E-8
B
52
637
F06 Backup alarm short to ground
Motor - Starter
C-13
5
Switch - Headlamp Dimmer
E-9
B
58
688
F06 VHP solenoid short to ground
Motor - Washer, Front Lower
F-6
8
Switch - Inching Pedal Pressure
C-15
14
59
688
F03 VHP solenoid short to battery
Motor - Washer, Front Upper
F-6
8
Switch - Key Start
B-9
C
61
668
F02 Shift lever input invalid
Motor - Washer, Rear
F-5
8
Switch - Park Brake Pressure
B-11
16
62
668
F03 Shift lever open/short to +battery
Motor - Wiper, Front Lower
C-4
9
Switch - Start Aid
E-8
B
63
269
F00 Sensor supply voltage above normal
Motor - Wiper, Front Upper
D-4
D
Switch - Stop Lamp Pressure
A-2
16
64
269
F01 Sensor supply voltage below normal
Motor - Wiper, Aear
B-11
D
Switch - Tail Lamp
D-8
B
65
701
F02 Transmission output speed signal incorrect
Relay - Start
D-13
5
Switch - Transmission Oil Temp Sensor
E-15
26
68
168
F01 System voltage below normal
Relay - Transmission Action Lamp
C-10
8
Switch - Wiper, Front Lower
A-5
C
71
520
F02 Invalid transmission configuration code
Resistor - Blower Speed
A-12
E
Switch - Wiper, Front Upper
B-5
C
72
268
F02 Check programmable parameters
Resistor - Blower Speed
E-4
E
Switch - Wiper, Rear
A-5
C
73
764
F05 Transmission indicator lamp open circuit
Resistor - Blower Speed (Heater Group)
A-10
E
74
764
F06 Transmission indicator lamp shortto ground
Machine locations are repeated for components located close together.
75
764
A = Operator’s compartment (Dash).
76
177
77
177
F03 Transmission indicator lamp shortto battery Transmission oil temperture sendershort to F03 + battery or open circuit F04 Transmission oil temperture switchshort to ground
81
868
F05 Auto/Manual lamp open circuit
82
868
F06 Auto/Manual lamp short tc ground
83
868
F03 Auto/Manual lamp short to +battery
2
Electrical Schematic Symbols And Definitions
Typical representation of a Sure-Seal connector. The plugand receptacle contain both pins and sockets.
55.17 ± 5.77
T
Pressure Symbol
Pin or Socket Number
1.55 ± 0.1510.3 ± 1.03
Wire, Cable, or Harness Assembly Identification
C
1000 to 1200
A
A 325-PK-14
31.1 ± 2.4 21.5 - 49.5 @ 552 kPa (80.1 psi) 227 - 257 @ 21 kPa (3.0 psi)
Pin
AA 1
9X-1123
Level Symbol
Flow Symbol
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
325-PK-14
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
Wire Color
Socket
Temperature Symbol
Component Part Number
Single Wire Connector
6.00
31 ± 3
¹ At room temperature unless otherwise noted.
2
Title
Form Number
Alternator (6N-9294): Consist No. 3T-6352 Consist No. 7N-9720 Consist No. 9G-4574
200-BK-14
Circuit Number Identification
Related Electrical Service Manuals
Alternator (100-5047): Consist No. 100-5045 Consist No. 100-5046
SENR4130 SENR2082
Electronic Transmission Shift Control
SENR9167
Starting Motor: (106-8558) Consist No. 106-8557 Consist No. 106-8559
SENR3559 SENR3581
Normally closed switch that will open with an increase of a specific condition.
Wire Gauge
Electrical Schematic Symbols And Definitions
SENR4978 SENR2082 SENR4130
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.
T
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.
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.
This indicates that the component has a wire connected to it that is connected to ground.
B = Operator’s compartment (Steering console).
Part No.
C = Operator’s compartment (Right side console).
2M-9346
Function
Off Machine Switch Specification Actuate
Deactuate
Contact Position
Stop Lamp Pressure
45.0 kPa Max (6.5 psi Max)
5.0 kPa MIN (0.5 psi MIN)
Normally Open
8C-3569
Engine Coolant Temp (Start Aid)
37.8 ± 2.8°C (100 ± 5°F)
26.7°C MIN (80°F MIN)
Normally Closed
107-0611
Engine Oil Pressure
93.00 ± 21.00 kPa (13.49 ± 3.05 psi)
70.00 ± 21.00 kPa (10.15 ± 3.05 psi)
Normally Open
111-7088
Inching Pedal Pressure
75.0 kPa MAX (10.9 psi MAX)
50.0 kPa MIN (7.3 psi MIN)
Normally Open
Brake/Park Brake Air Pressure
640 kPa MAX (92.0 psi MAX)
530 ± 40 kPa (77.0 ± 6.0 psi)
Normally Closed
D = Operator’s compartment (Headliner). E = Operator’s compartment (Under seat).
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
Receptacle
Plug
1 2
1 2
54°C (130°F) - 560 to 716 110°C (230°F) - 72 to 82
Sender - Engine Coolant
22
AA 1
3 to 97
7N-8532
21
A
Resistance (Ohms)¹
Sender - Articulation Position
112-2404
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. 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.
This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.