Differential Steering
CCK1-499
ALY1-853
CCS1-399
AKM1-765
CBL1-399
Electrical System
D6N Track-Type Tractor
January 2020
RENR5275-03
Pressure
Symbol
T
Temperature
Symbol
Level
Symbol
Flow
Symbol
Circuit Breaker
Symbol
Harness and Wire Symbols
Symbols
Symbols and Definitions
Harness And Wire Electrical Schematic Symbols
Fuse: A component in an electrical circuit that will open the circuit if too much current flows
through it.
Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The
circle indicates that the component has screw terminals and a wire can be disconnected from it.
Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.).
No circle indicates that the wire cannot be disconnected from the component.
Ground (Wired): This indicates that the component is connected to a grounded wire. The
grounded wire is fastened to the machine.
Ground (Case): This indicates that the component does not have a wire connected to ground.
It is grounded by being fastened to the machine.
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.
T
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.
Magnetic Latch Solenoid: A magnetic latch solenoid is an electrical component that is
activated by electricity and held latched 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.
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.
1
2
AG-C4
111-7898
L-C12
3E-5179
9X-1123 Component
Part Number
Pin or Socket Number
Part Number: for Connector Receptacle
Part Number: for Connector Plug
Harness Identification Letter(s):
(A, B, C, ..., AA, AB, AC, ...)
Plug
325-AG135 PK-14
Wire Color
Wire Gauge*
Receptacle
1
1
2
2
Sure-Seal connector: Typical representation
of a Sure-Seal connector. The plug and receptacle
contain both pins and sockets.
Deutsch connector: Typical representation
of a Deutsch connector. The plug contains all
sockets and the receptacle contains all pins.
Fuse (5 Amps)
5A
Harness identification code:
This example indicates wire group 325,
wire 135 in harness "AG".
L-C12
3E-5179
Wire, Cable, or Harness
Assembly Identification: Includes
Harness Identification Letters and
Harness Connector Serialization
Codes (see sample).
Harness Connector Serialization Code:
The "C" stands for "Connector" and the
number indicates which connector in the
harness (C1, C2, C3, ...).
*Wire gauge is shown in AWG (American Wire Gauge)
but could also be shown in metric denoted with mm
© 2020 Caterpillar. All Rights Reserved. CAT, CATERPILLAR, LET’S DO THE WORK, their respective logos, “Caterpillar Yellow,” the “Power Edge”
and Cat “Modern Hex” trade dress, as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without
permission.
20 Page,
(Dimensions: 39 inches x 24 inches)
RENR5275-03
MACHINE HARNESS CONNECTOR AND COMPONENT LOCATIONS
A
3
4
5
6
8
9
10
11
12
14
15
13 16
B
C
D
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
46
47
48
49
50
51
52
53
54
55 56
A
3
4
56
8
9
10
11
12 14
15
13
16
B
C
D
1
2
17
18 19
20
21
22
23
24
25
26
27 28
29 30
31
32
37
35
33
34
36
38
739
40
41
42
43
44
45
46
47
48
49
50 51
52
53
54
55
56
57
58
59
60
57
58
59
60
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.
Component Schematic
Location Machine Location
CONN 1 D-9 1
CONN 2 D-9 2
CONN 3 C-9 3
CONN 4 C-8, C-9 4
CONN 5 B-8 5
CONN 6 PRODUCT LINK A-9, B-9 D
CONN 7 MONITOR SERVICE CONNECTOR A-8 6
CONN 8 SERVICE TOOL CONNECTOR A-8 6
CONN 9 D-8 7
CONN 10 D-8 8
CONN 11 D-7, D-8 9
CONN 12 A-7 10
CONN 13 A-7 10
CONN 14 B-7 10
CONN 15 E-7 8
CONN 16 E-7 8
CONN 17 E-7 8
CONN 18 B-6 11
CONN 19 D-5, C-5 12
CONN 20 D-5 C
CONN 21 D-6 14
CONN 22 STARTING CHARGE ANALYZER E-5 15
CONN 23 E-5 15
CONN 24 A-4 16
CONN 25 A-4 A
CONN 26 A-4, A-5 A
CONN 27 B-4 A
CONN 28 B-4 A
CONN 29 B-4 A
CONN 30 E-4 17
CONN 31 E-4 17
CONN 32 D-3 18
CONN 33 E-3 19
CONN 34 E-3 19
CONN 35 E-3 19
CONN 36 E-3 19
CONN 37 E-2 20
CONN 38 E-2 20
CONN 39 D-1 21
CONN 40 C-8 50
Connector Location
Machine locations are repeated for components located close together.
A = Located on dash.
B = Located inside of right console.
C = Located inside of left console.
D = Located around headliner.
Component Schematic
Location
Machine
Location Component Schematic
Location
Machine
Location
12V Battery #1 E-9 22 Sender - Power Train Oil Temperature D-2 50
12V Battery #2 E-9 22 Sensor - Inj. Action Press C-1 21
12V Power Outlet (LH) A-8 13 Sensor - Bot. S/T D-1 30
12V Power Outlet (RH) A-8 B Sensor - Coolant Level E-1 51
Alarm - Action B-4, B-5 16 Sensor - Coolant Temperature C-1 24
Alarm - Backup B-9 23 Sensor - Decel Pedal Postion C-3 16
Alarm - Backup (Open Rops) A-9 D Sensor - Directional Position D-7 C
Alternator B-2 24 Sensor - Engine Speed D-2 52
Assembly - Fan Drive E-1 25 Sensor - Fuel Pressure C-1 51
Auxillary Power E-4 26 Sensor - Hydraulic Oil Temperature E-8 53
Beacon E-9 27 Sensor - Intake Manifold Air Temperature C-1 21
Breaker - Alternator E-6 15 Sensor - Oil Pressure C-1 21
Buss Bar "A" E-6 15 Sensor - Oil Temperature C-1 21
Buss Bar "C" E-6 15 Sensor - Top S/T D-1 30
Coil - Ferrite E-8 28 Sensor - Turbo Outlet Pressure C-1 21
Coil - MSS Exicter A-6 A Sensor - XMSN Input Speed D-2 54
Connector - Monitor Service A-8 13 Sensor - XMSN Inter Spd #1 C-9 54
Connector - Service Tool A-8 13 Sensor - XMSN Inter Spd #2 C-9 54
Control - Caterpillar Monitoring System A-5 A Sensor - XMSN Out Spd #1 C-9 54
Control - Drivetrain C-6, D-6 C Sensor - XMSN Out Spd #2 C-9 54
Control - Engine ECM C-2, D-2 29 Sensor - XMSN Temperature C-9 54
Control - MSS E-8 28 Sensor - Service Brake Pedal Position C-3 16
Converter - 24V to 12V D-7 17 Solenoid - A/C Clutch D-2 37
Diode - A/C E-2 30 Solenoid - First Gear Clutch D-9 54
Diode - Flyback E-6 15 Solenoid - Forward Clutch D-9 54
Fuse Block E-6 15 Solenoid - IAP Control C-1 21
Ground - Engine (LH) E-3 31 Solenoid - Injector #1 D-1 21
Ground - Engine (RH) B-2 32 Solenoid - Injector #2 D-1 21
Ground - Front Frame B-2 35 Solenoid - Injector #3 D-1 21
Ground - Headliner A-7 D Solenoid - Injector #4 D-1 21
Ground - Platform #1 E-7 8 Solenoid - Injector #5 D-1 21
Ground - Platform #2 E-7 8 Solenoid - Injector #6 D-1 21
Ground - Rear Frame E-9 36 Solenoid - Brake C-9 55
Heater - Inlet Air B-1 37 Solenoid - Park Brake Dump C-9 55
Horn E-1 38 Solenoid - Reverse Clutch D-9 54
Lamp - Action B-6 A Solenoid - Second Gear Clutch D-9 54
Module - Lamp Gear B-6 A Solenoid - Service Brake Dump C-9 54
Module - Quad Gage B-6 A Solenoid - Third Gear Clutch D-9 54
Motor - Cab Blower #1 A-4 39 Switch - Auto Downshift B-6 A
Motor - Cab Blower #2 A-4 39 Switch - Beacon A-6 A
Motor - Condensor #1 D-8 40 Switch - BI Directional Mode B-6 A
Motor - Condensor #2 D-8 40 Switch - Blower A-6
G-12
A
Motor - Fuel Priming Pump D-8 41 Switch - Console C
Motor - Rops Blower A-4 39 Switch - Disconnect E-8 57
Motor - Seat Suspension B-9 42 Switch - Downshift C-7 C
Motor - Starter B-2 43 Switch - Forward Horn A-8 B
Motor - Washer Front E-4 44 Switch - Fuel Priming Pump D-2 58
Motor - Washer Left E-4 44 Switch - Hydraulic Bypass E-1 38
Motor - Washer Rear E-4 44 Switch - Key Start A-6 A
Motor - Washer Right E-4 44 Switch - Lamp A-6 A
Motor - Wiper Front B-4, B-5 39 Switch - Operator Monitor B-6 A
Motor - Wiper Left D-6 35 Switch - Parking Brake C-7 C
Motor - Wiper Rear B-7 D Switch - PTO Bypass Filter C-9 59
Motor - Wiper Right B-7 46 Switch - Refrigerant E-2 37
Product Link B-9 D Switch - Reverse D-7 C
Relay - Condensor D-9 47 Switch - Service Brake Pedal C-3 60
Relay - Inlet Air Heater C-1 37 Switch - Throttle A-8 B
Relay - Main E-6 15 Switch - Upshift C-7 C
Relay - Start E-6 15 Switch - Wiper Front B-8 D
Resistor - Backlight B-6 A Switch - Wiper Left B-8 D
Resistor - Cab Blower Motor A-4 39 Switch - Wiper Rear B-8 D
Resistor - Rpos Blower Motor A-4 39 Switch - Wiper Right B-8 D
Resistor - Starter B-2 48 Thermostat A-4 39
Sender - Fuel Level E-8 50
Component Location
