12H, 140H AND 160H MOTOR GRADERS ELECTRICAL (NA VERSION).

©
1997 Caterpillar
All Rights Reserved
Printed in U.S.A.
A AA
1
2
325-PK-14
200-BK-14
T
This indicates that the component does not have a wire connected to ground. It is
grounded by being fastened to the machine.
This indicates that the component has a wire connected to it that is connected to ground.
105-9344
T
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
Pin
Socket
Fuse
Component
Part Number
Pin or Socket
Number
Receptacle
Plug
Wire Gauge
Wire, Cable, or Harness
Assembly Identification
Wire Color
Normally closed switch that will open with an increase of a specific condition.
No circle indicates that the wire cannot be disconnected from the component.
Single Wire
Connector
Circuit Number
Identification
Ground
Connection
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Circuit Breaker
Symbol
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.
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 Symbols
Electrical Schematic Symbols And Definitions
1
1
2
2
Typical representation of a Sure-Seal
connector. The plug and receptacle
contain both pins and sockets.
Typical representation of a Deutsch
connector. The plug contains all
sockets and the receptacle contains
all pins.
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)¹
3E-5383 Sender - Articulation Position Range - 3 to 97 Ohms
3E-6424
Solenoid - Dual HP
Push Coil
Pull Coil
4.2 ± 0.42
16.1 ± 1.61
3E-7985
Solenoid - Engine Shutdown
Start (Latch) Coil
Stop (Unlatch) Coil
4.2 ± 0.42
16.1 ± 1.61
3T-3123 Resistor - Panel Dimmer 25.0 ± .3
6T-2217 Resistor - Starter/Diagnostic Conn 150 ± 7.5
7N-8532 Sender - Engine Coolant Temp
54°C (130°F) - 560 to 716
110°C(230°F) - 72 to 82
7T-4003 Resistor - Power 10.0 ± 0.5
7T-6517 Solenoid - Blade Cushion 20.1 ± 1.0
7T-9073 Solenoid - Differential Unlock 33.6 ± 1.0
7T-9074 Solenoid - Foward Horn/Park Brake 55.17 ± 5.77
8T-8610 Solenoid - Dual HP 13.5 ± 10
8T-8808 Solenoid - Centershift 343 ± 1.7
9G-1950 Resistor - Blower Speed
Overall 2.00 ± .10
Tap 1.00 ± .05
9G-4365 Solenoid -Start Aid 6
9W-2739
101-1759
Solenoids - Transmission
Solenoids - A/C Clutch
31 ± 3
14.4 ± 0.6
¹ At room temperature unless otherwise noted.
Code
Flashed
CID - FMI Description
11 N/A
No diagnostics active
12 N/A
No logged diagnostic codes
21 641 F05
Transmission Solenoid A open circuit
22 642 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
35 645 F06
Transmission Solenoid E short to ground
36 646 F06
Transmission Solenoid F short to ground
37 647 F06
Transmission Solenoid G short to ground
38 648 F06
Transmission Solenoid H short to ground
41 641 F03
Transmission Solenoid A short to battery
42 642 F03
Transmission Solenoid B short to battery
43 643 F03
Transmission Solenoid C short to battery
44 644 F03
Transmission Solenoid D short to battery
45 645 F03
Transmission Solenoid E short to battery
46 646 F03
Transmission Solenoid F short to battery
47 647 F03
Transmission Solenoid G short to battery
48 648 F03
Transmission Solenoid H short to battery
52 637 F06
Backup alarm short to ground
54 444 F05
Start Relay Open Circuit
55 444 F06
Start Relay Short To Ground
56 444 F03
Start Relay Short To Battery
58 688 F06
VHP 1 solenoid short to ground
59 688 F03
VHP 1 solenoid short to battery
61 668 F02
Shift lever input invalid
62 668 F03
Shift lever open/short to +battery
63 269 F00
Sensor supply voltage above normal
64 269 F01
Sensor supply voltage below normal
65 701 F02
Transmission output speed signal incorrect
68 168 F01
System voltage below normal
71 520 F02
Invalid transmission configuration code
72 268 F02
Check programmable parameters
73 764 F05
Transmission indicator lamp open circuit
74 764 F06
Transmission indicator lamp short to ground
75 764 F03
Transmission indicator lamp short to battery
76 177 F03
Transmission oil temperature sender short to
battery or open circuit
77 177 F04
Transmission oil temperature switch short to
ground
Diagnostic Code Conversion
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
2M-9346 Brake Air Pressure (Stop Lamp)
45 kPa MAX
(6.5 psi MAX)
5 kPa MIN
(0.5 psi MIN)
Normally Open
3E-2033 Brake/Park Brake Air Pressure
640 kPa MAX
(92.0 psi MAX)
530±40 kPa
(77.0 ± 6.0 psi)
Normally Open
7N-9785 Engine Coolant Temp
107.2 ± 2.8°C
(225 ± 5°F)
93.0°C MIN
(200°F MIN)
Normally Closed
8N-1 693 Coolant Temperature (Start Aid)
37.8 ± 2.8°C
(100 ± 5°F)
26.7°C MIN
(80°F MIN)
Normally Closed
8N-2248 Hyd Oil Temperature
101 .7°C MIN
(215°F MIN)
93.3°C MIN
(200°F MIN)
Normally Closed
8T-8640 Steering Press
1206 kPa MAX
(l75psiMAX)
700 ± 103 kPa
(101.5±l5psi)
1-2 NO
1-3 NC
9W-3187 Fuel Pressure (EMS)
93 ±21 kPa
(13.5 ± 3.0 psi)
69 ±21 kPa
(10.0 ± 3.0 psi)
Normally Closed
9X-0378 Engine Oil Pressure
62.0 kPa MAX
(9.0 psi MAX)
38 ± 20 kPa
(5.5 ± 3.0 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
114-5334 Refrigerant Pressure (A/C)
275 to 1750 kPa ¹
(40 to 255 psi)
-
-
Normally Open²
² Contact position at the contacts of the harness connector.
¹ A hysteresis band exists: with increasing pressure the closed condition can be maintained up to 2800 kPa (405 psi), with decreasing pressure the closed
condition can be maintained down to 170 kPa (25 psi).
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Alarm - Action
B-8 C
Resistor - Blower Speed (A/C)
B-11 15
Alarm - Backup
F-15 1
Resistor - Blower Speed (Heater)
A-11 E
Alternator (60A STD)
D-14 2
Resistor - Panel Lamp Dimmer
E-9 B
Arc - Suppressor
E-14 3
Resistor - Starter/Diag. Conn
C-14 42
Battery
C-14 5,6
Sender-Articulation
C-12 23
Beacon
C-10 7
Sender - Engine Coolant Temp
A-14 24
Beacon
A-12 7
Sender- Fuel Level
A-13 25
Breaker - Alternator (60A)
D-13 8
Sender - Transmission Speed
D-15 28
Breaker - Convertor (15A)
F-11 13
Sensor - Engine Speed
B-14 26
Breaker - Headlamp (15A)
D-10 B
Solenoid - A/C Clutch
A-13 22
Breaker - Lightbar (15A)
D-10 B
Solenoid - Centershift
B-3 29
Control - Engine Shutdown
E-13 9
Solenoid - Differential Unlock
E-14 4
Control - Neutral Start
A-8 10
Solenoid - Dual Horsepower
A-13 22
Control - Secondary Steer
E-13 9
Solenoid - Dual HP/Shutdown
A-12 22
Control - Transmission
A-7 C
Solenoid - Engine Shutdown
D-13 22
Converter - Voltage
F-10 12
Solenoid - Forward Horn
F-3 10
Converter - Voltage
F-12 13
Solenoid - Park Brake
B-11 10
Flasher
E-10 B
Solenoid - Start Aid
A-13 25
Fuses
D-9 B
Solenoids - Blade Cushion
E-2 30
Fuses
E-10 B
Solenoids - Transmission Valve (8)
D-15, E-15 27
Fuses (10A)
B-6 C
Switch - A/C Refrigeration
A-13 22
Gauge - Articulation
F-5 A
Switch - Air Dryer
F-14 31
Gauge - Engine Coolant Temperature
F-5 A
Switch - Beacon
B-6 C
Gauge - Fuel Level
E-5 A
Switch - Beacon
B-10 C
Gauge - Speedometer
F-5 A
Switch - Blower (A/C)
B-10 C
Gauge - System Air Pressure (Left)
E-5 A
Switch - Blower (Heater)
A-10 C
Gauge - System Air Pressure (Right)
E-5 A
Switch - Brake Air Pressure
A-2 11
Gauge - Tachometer
E-5 A
Switch - Brake Air Pressure
A-2 11
Ground - Cab
D-5 17
Switch - Centershift Indicator
B-3 29
Ground - Engine
C-13 19
Switch - Centershift Pin
B-9 C
Ground - Front Frame (A)
D-6 39
Switch - Cushion Blade
B-9 C
Ground - Front Frame (ZZ)
D-6 17
Switch - Defroster (Front)
A-6 C
Ground - Localized Stud
F-12 D
Switch - Defroster (Rear)
B-6 C
Ground - Rear Frame
C-13 8
Switch - Differential Unlock
D-9 B
Ground - Strap
C-12 23
Switch - Disconnect
C-14 6
Lamp - AIH Indicator
D-5 A
Switch - Engine Coolant Temp (Monitor)
B-14 24
Lamp - C Shift Pin
E-5 A
Switch - Engine Coolant Temp (Start Aid)
A-14 24
Lamp - Master Action
E-5 A
Switch - Engine Oil Pressure
C-13 32
Lamp - Shift Lever
B-9 C
Switch - Flood Lamps
D-8 B
Lamp - Transmission
D-5 A
Switch - Forward Horn
E-9 B
Lamp - Turn Indicator (Left)
E-5 A
Switch - Fuel Pressure
B-13 24
Lamp - Turn Indicator (Right)
E-4 A
Switch - Head/Tail Lamp
E-8 B
Meter - Service
E-10 B
Switch - Headlamp Dimmer
D-9 B
Monitor - Electronic Monitoring System(EMS)
E-6 A
Switch - Hydraulic Oil Temperature
C-12 33
Motor - Blower
A-12 15
Switch - Inching Pedal Pressure
C-15 27
Motor - Blower (A/C group)
B-10 14
Switch - Key Start
B-9 C
Motor - Blower (Heater group)
A-10 E
Switch - Light Bar Low Beam
E-8 B
Motor - Blower/Defroster
E-4 15
Switch - Monitor (EMS) Test
E-8 B
Motor - Secondary Steer
F-13 20
Switch - Panel Lamp Dimmer
E-9 B
Motor - Starter
C-13 19
Switch - Park Brake Pressure
B-11 34
Motor - Washer (Front Lower)
F-6 16
Switch - Primary Steer
F-10 35
Motor - Washer (Front Upper)
F-6 16
Switch - Start Aid/Monitor Test
E-10 B
Motor - Washer (Rear)
F-6 16
Switch - Stoplamp Pressure
A-2 11
Motor - Wiper (Front Lower)
C-4 17
Switch - Secondary Steer Test
B-8 C
Motor - Wiper (Front Upper)
D-4 17
Switch - Tail Lamp
D-8 B
Motor - Wiper (Rear)
A-11 18
Switch - Transmission Direction & Speed
A-8 C
Motors - Condenser
B-11 21
Switch - Transmission Oil Temp
E-15 27
Relay - Condenser
C-10 21
Switch - Turn Signal
D-9 B
Relay - Main
D-14 8
Switch - Wiper (Front Lower)
A-4 C
Relay - Secondary Steer
F-13 22
Switch - Wiper (Front Upper)
B-4 C
Relay - Start
D-13 8
Switch - Wiper (Rear)
A-4 C
Resistor - Blower Speed
A-11 E
Thermostat (A/C)
B-11 E
Resistor - Blower Speed
E-4 E
Machine locations are repeated for components located close together.
A = Operator’s compartment (Dash).
B = Operator’s compartment (Steering console).
C = Operator’s compartment (Right side console).
D = Operator’s compartment (Headliner).
E = Operator’s compartment (Under seat).
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Circuits
Accessory Circuits
101 RD
Bat (+)
500 BR
Wiper - Front (Park)
102 BU
HdLmp
501 GN
Wiper - Front (Low)
103 YL
AuxCkt
502 OR
Wiper - Front (HI)
105 BR
Key SW
503 BR
Wiper - Rear (Park)
107 WH
Eng Shut
504 YL
Wiper - Rear (Low)
108 BU
AuxCkt
505 BU
Wiper - Rear (HI)
109 OR
Alt Output (+) Term.
506 PU
Washer - Front
112 PU
Main Power Rly Output
507 WH
Washer - Rear
113 OR
Opr Mon Panel B+ Switched
508 PU
Radio Speaker - Left
114 GN
Warning Horn (Forward)
509 WH
Radio Speaker - Left (Commom)
115 PK
Aux Ckt
511 BR
Radio Speaker - Right
116 BR
Aux Ckt
512 GN
Radio Speaker - Right (Common)
118 GY
Aux Ckt
513 OR
A/C Compressor/Refrigerant Pressure SW
119 PK
Aux Ckt
515 GY
Blower Motor (HI)
122 BU
Aux Ckt
516 GN
Blower Motor (Medium)
124 GN
A/C
517 BU
Blower Motor (Law)
126 PK
Xmsn Ctrl
521 YL
A/C SW To Refrigerant SW
130 GN
Aux Ckt
522 WH
A/C Clutch Ta Thermostat SW
134 YL
Aux Ckt
537 GN
Turn Signal SW To Flasher
136 GN
Suppl Ster
556 WH
Differential Lock
141 PK
Aux Ckt
570 BU
Blade Cushion Sal
144 GN
Aux Ckt
575 YL
Wiper - Aux (Park)
149 PU
Aux Ckt
576 PK
Wiper - Aux (Low)
151 GN
Aux Ckt
577 PU
Wiper - Aux (HI)
152 BU
Aux Ckt
578 BU
Washer - Aux
158 BR
Aux Ckt
584 YL
Wiper SW Jumper
160 PU
Aux Ckt
592 BU
DC/DC Converter Power Output
165 YL
Aux Ckt
593 GN
Condensor Fan Relay To Motors
169 PK
Aux Ckt
597 PU
A/C HI Press. Coutout SW To Low Press. SW
173 YL
Aux Ckt
A503 PK
Front Defroster Fan (Low)
176 OR
Aux Ckt
A504 GN
Rear Defroster Fan (Low)
Ground Circuits
A506 OR
Front Defroster Fan (HI)
200 BK
Main Chassis
A507 YL
Rear Defroster Fan (HI)
201 BK
Operator Monitor Return
A513 PK
DC/DC Converter Memory Output
202 BK
XMSN Ctrl
Lighting Circuits
203 BK
Chassis Diagnostic
600 BR
Dash Lamp Basic
207 BK
Starter Diagnostic
601 GY
Dash Lamp Hi
277 BK
XMSN Ctrl Ident Code 1
603 PK
Rotary Beacon
278 BK
XMSN Ctrl ldent Code 2
604 OR
Stop Lamp
Basic Machine Circuits
605 YL
Turn Lamp Left
301 BU
Starter No. 1 Sol
606 GY
Turn Lamp - Right
302 OR
Starter No. 1 Resistor to Diagnostic
608 GN
Flood Lamp - Rear
304 WH
Starter Relay No. 1 Output
609 YL
Flood Lamp - Side
306 GN
Starter Relay Coil To Neut Start SW Or Key SW
611 PU
HeadLamp Hi
307 OR
Key SW To Neut Start SW
614 PU
Park/Tail/Dash/Lamp
308 YL
Main Power Relay Coil
619 GN
Head Lamp Lo
310 PU
Start Aid SW To Start Aid Sol
629 PK
Aux Head Lamp
311 WH
Start Aid Sal To Temp SW
Control Circuits
321 BR
Bckp Alarm Lamp Travel Alarm
710 GN
XSMN Speed Pickup Signal
322 GY
Warning Horn (Forward)
727 GN
Suppl Ster Motor Relay
326 PU
Key SW “C” Term.
728 BU
Suppl Ster Cant SW
327 PK
Shutdown Sol
751 ON
XMSN Shift Sal No. I Or 3
334 BU
Start Aid Sol #2
752 YL
XMSN Shift Sol No. 2
373 GN
Start Aid Switch To Timer
754 BU
XMSN Shift Sal No. 3 Or 1
Monitoring Circuits
755 OR
XMSN Shift Sal No. 4 Or 5
403 GN
Alternator (R) Term.
758 GM
AWD Clutch SW
404 YL
Opr Mon Hyd Oil Temp
795 YL
Dual Hp Sal
405 GY
Opr Mon Oil Press. (Low Setting)
B751 GN
Centershift Lock Sol
406 PU
Opr Mon Coolant Temp
F769 BU
AWD Ta Inch Pedal SW
408 WH
Opr Mon System Air Press.
892 BR
Start Mod Right (-) Part/CAT Data Link (-)
409 OR
Opr Mon Neut
893 GN
Start Mad Right (+) Part/CAT Data Link (+)
410 WH
Opr Mon Fault Alarm
B899 OR
AWO Agressiveness Cant Lever
411 PK
Opr Mon Master
900 PU
XMSN Shift Sal No. 4
413 BR
Opr Mon Fuel Press.
901 WH
XMSN Shift Sal Na. 6
415 GN
Opr Man Test SW
902 BR
XMSN Shift Sol No. 7
417 GY
Primary Ster SW
903 GY
XMSN Shift Sal No. 8
419 YL
Opr Mon Parking Brake
921 WH
XMSN Sal Na 1 Or 3 Return
439 YL
Lamp Indicator
977 YL
CST Autoshift - Auto/Manual SW 1
441 OR
Eng Coolant Temp Gage
E937 PU
MG MESH CNTL - Redundant Neutral
447 PK
Fuel Level Gage
E938 OR
MG MESH CNTL - First Gear
449 BU
Spdom Sender (Signal No. 1)
E939 WH
MG MESH CNTL - Second Gear
450 YL
Tach Sender (+)
E940 BU
MG MESH CNTL - Third Gear
462 YL
Suppl Ster Motor Indicator
E941 YL
MG MESH CNTL - Fourth Gear
467 WH
System Fault (Xmsn)
E942 GN
MG MESH CNTL - Fifth Gear
485 YL
Opr Mon Panel AWD Fault
E943 BR
MG MESH CNTL - Sixth Gear
488 WH
Air SW to AIR SW Jumper
E944 GY
MG MESH CNTL - Seventh Gear
A429 YL
Articulation Indicator
E945 PU
MG MESH CNTL - Eigth Gear
G460 GN
Transmission Temperature SW
E946 OR
MG MESH CNTL - Forward Direct
E947 WH
MG MESH CNTL - Reverse Direct
E948 BU
MG MESH CNTL - Park
E949 YL
MG MESH CNTL - Neutral
E975 PU
MESH Lamp
A
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
1
2
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
37
35
33
34
36
38
7
39
40
41
42
43
44
45
A
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
1
2
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
37
35
33
34
36
38
7
39
40
41
42
43
44
45
Machine Harness Connector And Component Locations
Related Electrical Service Manuals
Form Number
Alternator (6N-9294 35A): STD
Consist No. 3T-6352
Consist No. 7N-9720
Consist No. 9G-4574
SENR4978
SENR2082
SENR4130
Alternator (100-5047 50A): ATT SENR2082
Electronic Monitoring System SENR2945
Electronic Transmission Shift Control SENR6982
Starting And Charging Systems SENR2947
Starting Motor: (106-8555)
Consist No. 6V-5207
Consist No. 6V-5023
Consist No. 6V-5226
SENR3581
SENR3536
SENR4975
Title
Connector Location
Connector Number
Schematic
Location
Machine
Location
CONN 1 D-15 27
CONN 2 E-15 27
CONN 3 E-15 27
CONN 4 F-14 36
CONN 5 F-14 41
CONN 6 Start and Charge Diag. E-14 42
CONN 7 A-14 25
CONN 8a A-14 43
CONN 8b A-14 43
CONN 9 B-13 37
CONN 10 B-13 37
CONN 11 B-13 37
CONN 12 D-13 37
CONN 13 D-13 37
CONN 14 D-13 37
CONN 15 E-13 37
CONN 16 F-12 37
CONN 17 F-12 39
CONN 18 E-12 39
CONN 19 E-12 10
CONN 20 E-12 10
CONN 21 E-12 10
CONN 22 E-12 10
CONN 23 D-12 39
CONN 24 D-12 39
CONN 25 D-12 39
CONN 26 B-12 10
CONN 27 F-11 D
CONN 28 D-10 B
CONN 29 D-10 B
CONN 30 D-10 39
CONN 31 D-10 39
CONN 32 D-10 39
CONN 33 C-10 33
CONN 34a C-10 33
CONN 34b C-10 33
CONN 35a A-10 38
CONN 35b B-11 38
CONN 35c A-11 38
CONN 36 B-9 38
CONN 37 B-9 38
CONN 38 E-9 B
CONN 39 E-9 39
CONN 40 D-8 39
CONN 41 D-8 39
CONN 42 D-8 39
CONN 43 D-8 39
CONN 44 B-8 38
CONN 45 A-8 C
CONN 46 B-7 38
CONN 47 B-7 38
CONN 48 Service Tool B-7 C
CONN 49a F-7 39
CONN 49b F-7 39
CONN 50 E-6 17
CONN 51 E-6 17
CONN 52 E-6 17
CONN 53 D-6 17
CONN 54 C-6 17
CONN 55 C-6 17
CONN 56 C-6 17
CONN 57 C-5 40
CONN 58 A-6 40
CONN 59 C-5 40
CONN 60 C-5 40
CONN 61 B-3 44
CONN 62 E-3 45
CONN 63 E-3 45
CONN 64 F-3 45
CONN 65 F-3 45
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.
RENR1434
November 1997
12H, 140H And 160H
Electrical System
12H:
4XM1-1395
2WR1-641
8MN1-499
140H:
2ZK1-2391
9ZN1-204
9TN1-399
160H:
9EJ1-509
3GM1-79
Motor Graders (NA Version)