Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Alarm - Action B-8 CSender - Transmission Speed C-15 14
Alarm - Backup F-15 1Solenoid - Centershift B-3 16
Alternator (35A STD) D-14 2Solenoid - Differential Unlock E-14 17
Battery C-14 3,4 Solenoid - Dual Horsepower A-13 5
Breaker - Alternator (35A) D-13 5Solenoid - Engine Shutdown D-13 5
Breaker - Headlamp (15A) D-10 BSolenoid - Forward Horn A-3 16
Control - Neutral Start A-6 10 Solenoid - Park Brake B-12 16
Control - Transmission A-7 ESolenoid - Start Aid A-13 18
Fuses B-6 CSolenoids - Transmission Valve (8) D-15,E-15 14
Fuses D-9 BSwitch - Beacon B-16 C
Gauge Cluster F-5 ASwitch - Blower (Heater) A-10 C
Ground - Engine C-13 12 Switch - Brake Air Pressure A-2 16
Ground - Front Frame D-6 21 Switch - Centershift Indicator B-3 19
Ground - Rear Frame C-13 28 Switch - Centershift Pin B-8 C
Ground Strap - Cab to Front Frame D-6 24 Switch - Defroster (Front) A-6 C
Ground Strap - Front Frame to Rear Frame C-12 20 Switch - Defroster (Rear) B-6 C
Horn - Forward E-3 16 Switch - Differential Unlock D-8 B
Meter - Service E-10 BSwitch - Disconnect C-14 13
Motor - Blower (Heater group) A-10 ESwitch - Engine Coolant Temp (Start Aid) A-14 11
Motor - Blower/Defroster A-11 ESwitch - Flood Lamp D-8 B
Motor - Blower/Defroster E-4 ESwitch - Forward Horn E-9 B
Motor - Starter C-13 SSwitch - Fuel Pressure B-13 13
Motor - Washer (Front Lower) F-6 8Switch - Head/Tail Lamp E-8 B
Motor - Washer (Front Upper) F-6 8Switch - Headlamp Dimmer E-9 B
Motor - Washer (Rear) F-6 8Switch - Inching Pedal Pressure D-15 14
Motor - Wiper (Front Lower) C-4 9Switch - Key Start B-9 C
Motor - Wiper (Front Upper) D-4 DSwitch - Park Brake Pressure B-11 16
Motor - Wiper (Rear) B-11 DSwitch - Start Aid E-8 B
Relay - Start D-13 5Switch - Stoplamp Pressure A-2 16
Relay - Transmission Action Lamp C-10 8Switch - Tail Lamp D-8 B
Resistor - Blower Speed A-12 ESwitch - Transmission Direction & Speed A-8 C
Resistor - Blower Speed E-4 ESwitch - Transmission Oil Temperature D-15 26
Resistor - Blower Speed (Heater) A-10 ESwitch - Wiper (Front Lower) A-5 C
Sender - Articulation C-1 2 7Switch - Wiper (Front Upper) B-5 C
Sender - Engine Coolant Temp A-14 11 Switch - Wiper (Rear) A-5 C
Sender - Engine Oil Pressure B-14 13
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= Operators compartment (Under seat).
A
3
4
5
68
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
7
A
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
12
17
18
19
20 21
22
23
24
25
26
27
28
29
30
7
Machine Harness Connector And Component Locations
E20367
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
Transmission Electronic Shift Control SENR6982
Starting Motor: (106-8558)
Consist No. 106-8557
Consist No. 106-8559
SENR3559
SENR3581
Title
Connector Location
Connector Number Schematic
Location
Machine
Location
CONN 1 C-15 26
CONN 2 E-15 26
CONN 3 F-14 6
CONN 4 A-14 5
CONN 5 B-13 29
CONN 6 B-13 29
CONN 7 D-13 30
CONN 8 D-13 29
CONN 9 E-12 21
CONN 10 E-12 25
CONN 11 E-12 25
CONN 12 E-12 25
CONN 13 D-12 21
CONN 14 D-12 21
CONN 15 B-12 25
CONN 16 D-10 23
CONN 17 C-10 23
CONN 18 A-11 C
CONN 19 B-9 25
CONN 20 E-9 B
CONN 21 A-8 C
CONN 22 B-7 25
CONN 23 Service Tool B-7 C
CONN 24 E-6 24
CONN 25 E-6 24
CONN 26 C-6 24
CONN 27 C-6 27
CONN 28 A-6 27
CONN 29 C-5 27
CONN 30 C-5 27
CONN 31 B-3 15
CONN 32 E-3 23
CONN 33 F-3 23
CONN 34 F-3 23
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.
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 Starter relay open circuit
55 444 F06 Starter relay short to ground
56 444 F03 Starter relay short to battery
58 688 F06 VHP solenoid short to ground
59 688 F03 VHP 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 F0l Sensor supply voltage below normal
65 701 F02 Transmission output speed signal incorrect
68 168 F0l 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
77 762 F04
Transmission oil temperture switch
short to ground
Transmission Diagnostic Code Conversion
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Circuits Accessory Circuits (Continued)
101 RD Bat (+) 506 PU Washer - Front
102 BU Hd Lmp 507 WH Washer - Rear
103 YL Aux Ckt 515 GY Blower Motor (HI)
105 BR Key Start Sw 516 GN Blower Motor (Medium)
108 BU Aux Ckt 517 BU Blower Motor (Low)
109 OR Alt Output (+) Term. 521 YL A/C SW To Refrigerant SW
113 OR Opr Mon Panel 522 WH A/C Clutch To Thermostat SW
114 GN Warning Horn (Forward) 556 WH Differential Lock
116 BR Aux Ckt 575 YL Wiper - Aux (Park)
118 GY Aux Ckt 576 PK Wiper - Aux (Low)
119 PK Aux Ckt 577 PU Wiper - Aux (Hl)
124 GN A/C 578 BU Washer - Aux
130 GN Aux Ckt 584 YL Wiper SW Jumper
141 PK Aux Ckt A503 PK Front Defroster Fan (Low)
144 GN Aux Ckt A504 GN Rear Defroster Fan (Low)
149 PU Aux Ckt A506 OR Front Defroster Fan (HI)
151 GN Aux Ckt A507 YL Rear Defroster Fan (HI)
152 BU Aux Ckt Lighting Circuits
165 YL Aux Ckt 603 PK Rotary Beacon
Ground Circuits 604 OR Stop Lamp
200 BK Main Chassis 608 GN Flood Lamp - Rear
201 BK XMSN CtrI 609 YL Flood Lamp - Side
277 BK XMSN Ctrl Ident Code 1 611 PU Head Lamp Hi
278 BK XMSN CtrI Ident Code 2 614 PU Park/Tail/Dash/Lamp
Basic Machine Circuits 619 GN Head Lamp LoControl Circuits
301 BU Starter No. 1 Sol Control Circuits
304 WH Starter Relay No. 1 OutpuT 710 GN XMSN Speed Pickup Signal
306 GN Starter Relay Coil To Neut Start SW Or
KeyStart SW
751 GN XMSN Shift Sol No. 1 Or 3
307 OR Key Start SW To Neutral Start SW 752 YL XMSN Shift Sol No. 2
308 YL Main Power Relay Coil 754 BU XMSN Shift Sol No. 3 Or 1
310 PU Start Aid SW To Start Aid Sol 755 OR XMSN Shift Sol No. 4 Or 5
311 WH Start Aid Sol To Temp SW 758 GN AWD Clutch SW
321 BR Backup Alarm Lamp Travel Alarm 795 YL Dual Hp Sol
322 GY Warning Horn (Forward) B751 BU (NFND) Centershift Lock Sol
326 PU Key Start SW C Term. 892 BR Start Mod Right (-) Port/CAT Data Link (-)
Monitoring Circuits 893 GN Start Mod Right (+) Port/CAT Data Link (+)
404 GN Alternator (R) Term. G865 BU +12 Volt Switch Power
439 YL Lamp Indicator 900 PU XMSN Shift Sol No. 5 or 4
441 OR Eng Coolant Temp Gauge 901 WH XMSN Shift Sol No. 6
A429 YL Articulation Indicator 902 BR XMSN Shift Sol No. 7
A476 PU Eng Oil Press Gauge To Sender - Eng #1 903 GY XMSN Shift Sol No. 8
B476 BU (NFND) Transmission Indicator Lamp 921 WH XMSN Sol No 1 Or 3 Return
C491 PU Park Brake Pressure E937 PU MG MESH CNTL - Redundant Neutral
E458 YL Low Air Pressure Lamp E938 OR MG MESH CNTL - First Gear
E459 WH Low AIr Pressure Alarm E939 WH MG MESH CNTL - Second Gear
E460 BR Trans Cntl To Relay Coil E940 BU MG MESH CNTL - Third Gear
G460 GN Transmission Temperature E941 YL MG MESH CNTL - Fourth Gear
Accessory Circuits E942 GN MG MESH CNTL - Fifth Gear
500 BR Wiper - Front (Park) E943 BR MG MESH CNTL - Sixth Gear
501 GN Wiper - Front (Low) E944 GY MG MESH CNTL - Seventh Gear
502 OR Wiper - Front (HI) E945 PU MG MESH CNTL - Eighth Gear
503 BR Wiper - Rear (Park) E946 OR MG MESH CNTL - Forward Direct
504 YL Wiper - Rear (Low) E947 WH MG MESH CNTL - Reverse Direct
505 BU Wiper - Rear (HI) E948 BU MG MESH CNTL - Park
E949 YL MG MESH CNTL - Neutral
E975 PU MESH Lamp
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
2W-9346 Stop Lamp Pressure 45 kPa MAX
(6.5 psi MAX)
5 kPa MIN
(0.5 psi MIN) NormallyOpen
8C-3569 Coolant Temperature (Start Aid) 38 ± 3°C
(1 00.4° ± 5.4°F)
27 °C MIN
(80.6°F MIN) NormallyClosed
111-7088 Inching Pedal Pressure 75.0 kPa MAX
(10.9 psi MAX)
50.0 kPa MIN
(7.3 psi MIN) NormallyOpen
112-2024 Brake Air
Park Brake Pressure
640 kPa MAX
(92.0 psi MAX)
530 ± 40 kPa
(77.0 ± 6.0 psi) NormallyOpen
115-7103 Fuel Pressure (EMS) 93 ± 21 kPa
(13.5 ± 3.0 psi)
69 ± 21 kPa
(10.0 ± 3.0 psi) Normally Closed
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)¹
3E-5383 Sender - Articulation Position Range - 3 to 97 Ohms
7N-8532 Sender - Engine Coolant Temp 560 to 716 @ 54°C (130°F)
72 tO 82 @ 110°C(230°F)
7T-4003 Resistors - Defroster Blower 10.0 ± 0.5
7T-9073 Solenoid - Differential Unlock 33.6 ± 1.0
7T-9074 Solenoids - Forward Horn
Park Brake 55.17 ± 5.77
8C-3663
Solenoid - Engine Shutdown
Start (Latch) Coil
Stop (Unlatch) Coil
1.55 ± 0.1510.3 ± 1.03
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 6
104-6387 Sender - Transmission Speed 1000 to 1200
111-0570 Solenoid - Dual Horsepower 31.1 ± 2.4
116-9937 Sender - Engine Oil Pressure 21.5- 49.5 @552 kPa (80.1 psi)
227 - 257 @ 21 kPa (3.0 psi)
127-0574 Solenoids - Transmission 31 ± 3
¹ At room temperature unless otherwise noted.
RENR1440
January 1998
120H, 135H Motor Grader
Electrical System
120H:
5FM1-799
6TM1-365
135H:
7MM1-248
8WN1-349
(Standard Version)
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
CA
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
11
22
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.
1998 Caterpillar
All Rights Reserved
Printed in U.S.A.
©
