Page 1
RENR7299-11
February 2021
Harness And Wire Electrical Schematic Symbols
Symbols
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Symbols and Definitions
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.
Circuit Breaker
Symbol
307D, 311D, 311F, 312D, 312D2, 313D,
313D2, 315D, 318D, 318D2, 319D,
320D, 320D2, 323D and 323D2
Excavators and M313D, M315D,
M316D, M318D and M322D Wheeled
Excavators
Air Conditioning Electrical System
PUBLICATIONS.CAT.COM
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
T
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.
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.
Harness and Wire Symbols
Wire, Cable, or Harness
Assembly Identification: Includes
Harness Identification Letters and
Harness Connector Serialization
Codes (see sample).
1
L-C12
3E-5179
L-C12
3E-5179
AG-C4
111-7898
Part Number: for Connector Plug
2
Plug
1
2
1
2
© 2021 Caterpillar. All Rights Reserved. CAT, CATERPILLAR, LET’S DO THE WORK, their respective logos, “Caterpillar Corporate 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.
Deutsch connector: Typical representation
of a Deutsch connector. The plug contains all
sockets and the receptacle contains all pins.
Sure-Seal connector: Typical representation
of a Sure-Seal connector. The plug and receptacle
contain both pins and sockets.
Receptacle
Pin or Socket Number
Harness identification code:
This example indicates wire group 325,
Harness Identification Letter(s):
(A, B, C, ..., AA, AB, AC, ...)
Harness Connector Serialization Code:
The "C" stands for "Connector" and the
number indicates which connector in the
harness (C1, C2, C3, ...).
Part Number: for Connector Receptacle
5A
Fuse (5 Amps)
wire 135 in harness "AG".
*Wire gauge is shown in AWG (American Wire Gauge)
but could also be shown in metric denoted with mm
9X-1123
325-AG135 PK-14
Component
Part Number
Wire Gauge*
Wire Color
RENR7299-11
12 Page,
(Dimensions: 25 inches x 24 inches)
Page 2
BK/RD-20
L-GN/RD-20
PU/YL-20
BK/GN-20
BK-20
GY/YL-20
PK/GN-20
BK/YL-20
GY/BU-20
GY/YL-20
BR/WH-20
BK/RD-20
PU/GN-20
BK-20
DETAIL OF CONN F
DETAIL OF CONN FF
BR/WH-20
BU/BK-20
BR/BK-20
PK-20
OR/BU-20
GY/BU-20
BK/YL-20
PK-20
BK/GN-20
PU/YL-20
WH/YL-20
S-BU-20
BU/OR-20
PU/RD-20
DETAIL OF CONN CC
21
DETAIL OF CONN A
Type 1
L-GN/YL-20
BK-20
DETAIL OF CONN DD
DETAIL OF CONN EE
BK/RD-20
BU/OR-20
OR/BU-20
PK/GN-20
BK-20
BU/BK-20
BR/BK-20
L-GN/RD-20
BR/OR-20
WH/RD-20
PK/BK-20
GY/YL-20
OR/BU-20
BK/RD-20
21
13
PU/RD-20
PK/BK-20
14
S-BU-20
PU/GN-20
L-GN/YL-20
WH/YL-20
BR/OR-20
WH/RD-20
54321
DETAIL OF CONN AA
PU/YL-20
BK/GN-20
PK-18
BK/RD-20
BR/WH-20
GY/YL-20
BK/YL-20
GY/BU-20
DETAIL OF CONN BDETAIL OF CONN BB
PU/RD-20
BU/OR-20
S-BU-20
PU/GN-20
WH/YL-20
DETAIL OF CONN C
BK-20
DETAIL OF CONN D
GY/YL-20
DETAIL OF CONN E
CONN EE
CONN FF CONN F
BK/RD-20
GY/YL-20
CONN E
OR/BU-20
2
GY/YL-20 GY/YL-20
1
BK/RD-20
2
BK-20
1
161514131211109
876
Type 1
L-GN/YL-20
OR/BU-20
OR/BU-20
17 18 19 20 21 22
L-GN/RD-20
BR/BK-20
BU/BK-20
BK-20
PK/GN-20
OR/BU-20
PK/BK-20
WH/RD-20
282726252423
15
CONN DD
OR/BU-20
GY/YL-20
BK/RD-20
BK-20
1
2
3
4
5
6
1
CONN D
OR/BU-20
BK/RD-20
BK-20
CONN BB
CONN B
BK/GN-20
BR/WH-20
5A
OR/BK-20
BK/RD-20
L-GN/RD-20
PU/YL-20
PU/YL-20
BK/GN-20
231
PU/YL-20
BK/GN-20
BR/WH-20
BU/BK-20
BR/BK-20
PK-20
BR/BK-20
L-GN/RD-20
BK/RD-20
PK-20
567
4
PK-18
BR/BK-20
L-GN/RD-20
BK/RD-20
987654321
PK/GN-20
BK-20
GY/YL-20
BR/WH-20
BU/BK-20
GY/YL-20
8
9
BR/WH-20
BU/BK-20
GY/YL-20
CONTROL PANEL
TYPE 1
16151413121110
BK/YL-20
OR/BU-20
GY/BU-20
PK/GN-20
OR/BU-20
GY/BU-20
BK/YL-20
BK-20
14
13
111012
GY/BU-20
OR/BU-20
BK/YL-20
BK-20
PK/GN-20
17
PK/BK-20
PU/RD-20
BU/OR-20
WH/RD-20
PU/GN-20
S-BU-20
BU/OR-20
PU/RD-20
PK/BK-20
132
BU/OR-20
PU/RD-20
PK/BK-20
S-BU-20
PU/GN-20
S-BU-20
PU/GN-20
BR/OR-20
WH/YL-20
WH/RD-20
WH/YL-20
BR/OR-20
8
7
645
WH/YL-20
WH/RD-20
CONN AA
2827262524232221201918
CONN A
L-GN/YL-20
L-GN/YL-20
9
10
L-GN/YL-20
CONN CC
CONN C
BLU/ORN-20
WH/RD-20
PU/GRN-20
PU/RD-20
CONN BB
CONN B
987654321
BR/BK-20
BLU/BK-20
BK/GN-20
L-GRN/RD-20
PU/YL-20
L-GN/RD-20
BK/RD-20
231
2
BK/GRN-20
BU/BK-20
BR/BK-20
PK-18
546
CONTROL PANEL
PK/GRN-20
ORN/BLU-20
PU/YL-20
GY/BLU-20
PK/GN-20
BR/WH-20
BK-20
GY/YL-20
7
8
TYPE 2
BR/WH-20
GY/YL-20
BK/YL-20
GY/BU-20
BK/YL-20
13
111012914
2
1
GY/YL-20
GY/BU-20
BR/ORN-20
L-GRN/YL-20
WH/YL-20
OR/BU-20
CONN JJ
CONN J
28272625242322212019181716151413121110
PK/BK-20
S-BLU-20
PK-18
BU/OR-20
PU/RD-20
PK/BK-20
132
3
S-BU-20
PU/GN-20
WH/RD-20
BR/OR-20
7
645
BK/RD-20
WH/YL-20
L-GN/YL-20
8
9
10
373635343332313029
CONN CC
CONN C
1
2
GY/YL-20
BK/YL-20
403938
BK-20
CONN HH
CONN H
1
CONN AA
CONN A
21 22 23
24 25 26
27 28 29
30 31 32
33 34 35
36 37 38
1 2 3
4 5 6
7 8 9
10 11 12
DETAIL OF CONN AA
Type 2
L-GRN/RD-20
BR/BK-20
BLU/BK-20
PU/GRN-20
WH/RD-20
PU/RD-20
BLU/ORN-20
BR/WH-20
BR/ORN-20
L-GRN/YL-20
WH/YL-20
4
2
1
GY/YL-20
PK/GN-20
PK-18
S-BLU-20
PK/BK-20
DETAIL OF CONN A
Type 2
CONN GG
CONN G
13 14 15
16 17 18
39 40
19 20
BK/GRN-20
BK/RD-20
ORN/BLU-20
PK/GRN-20
GY/BLU-20
PU/YL-20
BK/YL-20
GY/YL-20
BK-20
1 2
DETAIL OF CONN JJ
GY/YL-20
DETAIL OF CONN J
L-GN/RD-20
GY/YL-20
DETAIL OF CONN K
GY/BU-20
DETAIL OF CONN HH
GY/YL-20
DETAIL OF CONN H
WH/RD-20
PU/GN-20
PU/YL-20
1 2
BK/YL-20
DETAIL OF CONN GG
GY/YL-20
DETAIL OF CONN G
42
5 6
1 3 7
DETAIL OF CONN KK
21
PK/GN-20
5
MOTOR
WH/RD-20
PU/GN-20
PU/YL-20
GY/YL-20
L-GN/RD-20
CONN K
7
6
5
4
3
2
1
CONN KK
S-BU-20
DETAIL OF CONN L
L-GN/RD-20
GY/YL-20
PK/BK-20
BU/OR-20
BK/GN-20
OR/BK-20
PU/RD-20
DETAIL OF CONN LL
42
6542
731
76531
6
DETAIL OF CONN M
DETAIL OF CONN MM
12
CONN T
10A
POS
NEG
RD-14
OR/BK-18
DETAIL OF CONN S
BK-18
RD-18
2
1
LIGHT
15A
RD/GN-16
PK-18
BK-14
1
2
3
4
5
6
7
8
9
10
11
12
OR/BK-18
RD-14
RD/GN-16
PK-18
BK-14
CONN S
OR/BK-20
OR/BK-18
OR/BK-20
OR/BK-20
PK/BK-20
S-BU-20
CONN L
PU/RD-20
BU/OR-20
BK/GN-20
L-GN/RD-20
GY/YL-20
CONN M
7
6
5
4
3
2
1
CONN LL
7
6
5
4
3
2
1
CONN MM
MOTOR
MOTOR
BK-14
BK/BU-14
DETAIL OF CONN N
BR/BK-20
BU/BK-20
3
4
1 2
DETAIL OF CONN NN
7
Components List
Item
No.
Description Part#
1 Control Panel Assembly
2 Water Temperature Sensor 245-7831
3 Frost Sensor 245-7835
4 Recirculation Temperature Sensor 245-7815
(1)
5 Actuator 245-7817
6 Actuator 245-7813
7 Actuator 245-7817
11
0R/BK-20
L-GN/YL-20
OR/BK-20
1
4
3
CONN U
RD/GN-16
2
CONN UU
10
RD-14
OR/BK-20
1
4
WH/YL-20
PK/BU-14
2
3
CONN R
CONN RR
BK/BU-14
PK/BU-14
CONN P
1
2
CONN PP
MOTOR
9
8
BU/BK-20
432
BK/BU-14
BK-14
BR/BK-20
1
CONN N
CONN NN
8 Blower Control 245-7832
9 Blower Motor 245-7839
10 Blower Main Relay 196-1666
11 Clutch Solenoid Relay 196-1666
12 Refrigerant Compressor
(1)
13 Pressure Switch 130-0270
14 Ambient Temperature Sensor 235-8874
15 Air Conditioner Group
(1) Refer to the parts manual for your machine for the current part numbers
(1)
(Dimensions: 25 inches x 24 inches)
RENR7299-11
12 Page,
RD-18
DETAIL OF CONN T
BK-18
OR/BK-20
L-GN/YL-20
DETAIL OF CONN U
RD/GN-16
OR/BK-20
43
1 2
DETAIL OF CONN UU
Component Locations Table)
SYMBOL DESCRIPTION
CALLOUT FORMAT IF APPLICABLE
Callout Number
(Machine Location from
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ELECTRICAL CONNECTION TO
MACHINE STRUCTURE
INTERNAL ELECTRICAL CONNECTION
TO SURFACE OF COMPONENT
CONNECTOR
H#
CIRCUIT GROUPING DESIGNATION
ATCH WIRE, CABLE, COMPONENT
/
SPLICE
BLADE, SPADE, RING OR SCREW
TERMINAL
(52) VALVE GP - CONTROL
138-1234
Part Number
ABBREV
RD
WH
OR
YL
PK
BK
GY
PU
BR
GN
BU
OR/BK-20
WH/YL-20
DETAIL OF CONN R
Component
Name
COLOR
RED
WHITE
ORANGE
YELLOW
PINK
BLACK
GRAY
PURPLE
BROWN
GREEN
BLUE
PK/BU-14
RD-14
3
4
1 2
DETAIL OF CONN RR
BK/BU-14
DETAIL OF CONN P
PK/BU-14
DETAIL OF CONN PP
12
Do not operate or work on this product unless you have
read and understood the instruction and warnings in the
relevant Operation and Maintenance Manuals and
relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or
death. Proper care is your responsibility.
THIS SCHEMATIC IS FOR THE 307D, 311D, 311F, 312D, 312D2, 313D, 313D2, 315D, 318D,
318D2, 319D, 320D, 320D2, 323D AND 323D2 EXCAVATORS AND M313D, M315D, M316D,
M318D AND M322D WHEELED EXCAVATORS ELECTRICAL SYSTEM
MEDIA NUMBER: RENR7299-11
SCHEMATIC PART NUMBER: 235-8967, CHANGE: 02, VERSION: HE
SCHEMATIC PART NUMBER: 372-9415, CHANGE: 00, VERSION: HE
SCHEMATIC PART NUMBER: 420-7570, CHANGE: 00, VERSION: HE
Components are shown installed on a fully operable machine with the key and engine off, transmission shifter
in neutral and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.
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