Wire Number
Wire Color
101
RD
102
Wire Description Chart Wire Number
Wire Color
Bat (+) (Not Application Specific)
517
BU
Blower Motor (Low)
BU
Head Lamp Sw, Dome Lamp, Steer Col Sw
518
OR
Haz Sw to Flasher
103
YL
Func Lock Sw
536
WH
Hazard Sw to Steer Col Sw & Flasher
105
BR
Key Sw
546
BU
Aux A Sol
108
RD
B+ Radio
547
OR
Aux B Sol
112
PU
Main Power Rly Output to Fuses
548
GY
Aux Div Sol
113
OR
Indicator Lights (Power)
577
PU
Rear Wiper
114
GN
Warning Horn Sw (Forward)
585
YL
Func Lock Sw to Boom Ctrl Sw
Description Power Distribution Circuits
Connector Location¹
Accessory Circuits (cont'd)
Schematic Location
Machine Location
A-15
1
115
PK
Stabilizer Switches
A546
BU
Boom Ctrl Sw to Aux A Relay (coil)
CONN 2
C-14
1
116
BR
Frame Level Sw
A547
OR
Boom Ctrl Sw to Aux B Relay (coil)
CONN 3
A-14
1
117
YL
Speed Limiter
118
GY
Front Wiper Sw
603
PK
Rotary Beacon
119
PK
Rear Wiper/Washer Sw
604
OR
Stop Lamp
123
WH
Power to Gauges, Hi Cool Temp Alarm
605
YL
Turn Lamp - Left
124
GN
Heater Sw
606
GY
Turn Lamp - Right
Connector Number CONN 1
Trailer Option
CONN 4
A-13
1
F-12
C
CONN 6
D-12
17
CONN 7
B-12
15
CONN 5
System Calibration
RENR3405 June 1999
Description
9
126
PK
Park Brake Sw
607
PK
Flood Lamp
130
GN
Flood Lamp Sw
610
OR
Head Lamp Relay to Steer Col Sw
135
BU
Not Used
611
PU
Head Lamp Hi
136
GN
Steer Select Sw
614
PU
Head Lamp Sw to Lamp Fuses
C-11
17
CONN 10
C-11
17
144
GN
Beacon Sw
617
BR
Tail/Position Lamp - Left & Plate Lamp
CONN 11
D-11
17
147
PU
Lockout Rely (contact) to Stab Fuse and Frame Level Fuse
618
YL
Tail/Position Lamp - Right
CONN 12
E-11
17
157
YL
Haz Warn Sw (Turn Sig Ckt)
619
GN
Head Lamp Lo
CONN 13
E-11
17
161
PK
Haz Warn Sw (Haz Ckt)
622
PU
Flood Lamp Sw to Head/Flood Sw (TUV only)
162
YL
Aux Sw
627
YL
Fog Lamp
CONN 14
F-11
C
165
YL
Diff Lock Sw
629
PK
Head/Flood Lamp Sw to Head Lamp Relay (contact)
174
PK
Load Indicator
634
WH
Head Lamp/Side Sw to Head Lamp Sw (TUV only)
200
BK
Main Chassis
702
OR
XMSN Neutralizing Relay (contact)
H-12
C
H-11
C
CONN 17
H-8
19
727
GN
Prox Sw (Load) to Steer Relay (coil)
CONN 18
F-8
19
304
WH
Starter Relay Output
728
BU
Prox Sw (Supply) to Steer Relay (contact)
6
306
GN
Neut Start Relay (contact) to Start Relay (coil)
751
GN
XMSN High Sol
307
OR
Key Sw to Neut Start Relay (contact)
752
YL
XMSN Fwd Sol
308
YL
Main Pwr, Headlamp Rly, Backlights
754
BU
XMSN Rev Sol
310
PU
Cold Start Relay Coil
755
OR
XMSN 2nd Sol
Basic Machine Circuits
19
CONN 21
B-8
19
CONN 22
B-8
19
317
YL
Start Aid Relay To Start Aid Sol
762
YL
Lockout Relay to Boom Sensor
CONN 23
B-8
19
321
BR
Reverse Lamp, Backup Alarm
764
PU
Steer Select Sw B
322
GY
Warning Horn (Forward)
766
GN
XMSN Control Sw
324
BU
Differential Lock Sol
B753
YL
Frame Level Sw to Sol
Function Lock
A-6
C
327
PK
Func Lock Sw to Tilt Sol, Lockout Relay (contact)
B754
GN
Frame Level Sw to Sol
CONN 26
Roof Harness
I-5
19
329
YL
E Stop Sol
J755
BU
Left Frame Level Solenoid Return
330
YL
Neutral Start Relay Coil, Park Brake Sw
J756
BR
Right Frame Level Solenoid Return
H-3
A
CONN 29
E-2
18
CONN 30
D-2
18
¹The connectors shown in this chart are harness to harness and special use connectors. Connectors which join a harness to a component are generally located at on near the component. See the component location chart.
TH103 Electrical System
A
CONN 25
CONN 28
16
332
BU
Lockout Sw to Func Lock Sw
J757
PU
LH O/R Up Sol Return
A314
OR
Park Brake SW to Trans Neutralizer Relay Set
J758
PK
LH O/R Down Sol Return
A315
WH
Park Brake SW to Trans Neutralizer Relay Reset
J759
GN
RH O/R Up Sol Return
J760
YL
RH O/R Down Sol Return
Monitoring Circuits 403
GN
Alternator (R) Term to Serv Meter
818
BR
Indicator Sw
405
GY
Oil Press Sw
819
GY
Indicator Sw
441
OR
Eng Coolant Temp Gage
900
PU
XMSN 1st Sol
444
BU
Oil Temp Gage
910
YL
XMSN Neut Rly to Neut & Brk SW
447
PK
Fuel Level Gage
979
WH
Div Sols
F401
GY
High Coolant Temp Sw
980
BR
Telescope Out Sol
985
GY
Crab Steer Sol
Accessory Circuits
3PN530-836 3PN838-943 3PN945-989 3PN991-995
7
D-8
A
10
Control Circuits
CONN 20
B-4
B
6
CONN 16
CONN 27
19
A
CONN 15
19
C
18
1
15
7
CONN 9
B-8
3
12
15
CONN 24
5
4
B-12
E-8
13
17
Lighting Circuits
Ground Circuits
14
11
CONN 8
CONN 19
8
2
12 9
C 14
B
6 11 2
16
5
13
4
10 8
18
3 19 1
17 15
E90562
Machine Harness Connector And Component Locations
500
BR
Wiper - Front (Park)
986
OR
Four Wheel Ster Sol
501
GN
Wiper - Front (Low)
A979
WH
Tele Div Relay (coil)
502
OR
Wiper - Front (HI)
A980
PK
Tele Out Relay (coil)
506
PU
Washer - Front
C916
OR
Stab Sw to RH O/R Up Sol
507
WH
Washer - Rear
C917
YL
Stab Sw to RH O/R Down Sol
508
PK
Radio Speaker - Left
C918
GN
Stab Sw to LH O/R Up Sol
509
WH
Radio Speaker - Left (Common)
C919
PU
Stab Sw to LH O/R Down Sol
511
BR
Radio Speaker - Right
G969
YL
Tilt Sol Return
512
GN
Radio Speaker - Right (Common)
P917
BR
Speed Limiter to Pressure Sw
515
GY
Blower Motor (HI)
P918
GN
Press Sw to Speed Sensor
Schematic Location
Machine Location
Alarm - Backup
C-12
1
Alternator
D-11
Assembly - Gauge
A-3
Assembly - Fan
I-3
Schematic Location
Machine Location
Solenoid - Fwd
A-9
2
3
Solenoid - FWS
E-10
12
A
Solenoid - High
A-8
2
5
Solenoid - LH O/R Down
A-11
8
Component
Batteries
D-11
2
Solenoid - LH O/R Up
A-12
8
Control - XMSN
A-7
A
Solenoid - Rev
A-9
2
Flasher
I-14
B
Solenoid - RH O/R Down
A-11
8
Fuse Block
G-14
B
Solenoid - RH O/R Up
A-12
8
Fuse Block
F-14
B
Solenoid - Tele Out
A-10
8
Ground - Chassis
A-14
16
Solenoid - Tilt 1
A-10
8
F-4
A
Solenoid - Tilt 2
A-10
8
Grounds - Subframe
B-10
15
Solenoids - Fuel Level
C-11
9
Heater
D-12
B
Switch - Aux
C-5
A
Indicator Display
H-12
A
Switch - Beacon
E-5
A
Load Indicator
F-13
C
Switch - Boom Control
H-12
C
Motor - Front Washer
E-10
2
Switch - Brake Pedal
E-7
6
Motor - Front Wiper
E-1
A
Switch - Cold Start
D-5
A
Motor - Heater Assembly
G-10
C
Switch - Diff Lock
F-5
A
Motor - Roof Washer
E-10
2
Switch - Flood Lamp
C-5
A
Motor - Roof Wiper
H-2
7
Switch - Frame Level
G-11
C
Motor -Starter
D-12
4
Switch - Hazard Warning
G-5
A
Relay - Cold Start
D-11
2
Switch - Headlamp/Side
F-5
A
Relay - Main
I-15
B
Switch - Heater
G-11
C
Relay - Cold Start
E-11
2
Switch - Eng Cool Temperature
D-10
13
Relay - XMSN Neutralizing
I-15
B
Switch - Horn
E-3
A
Relay Block
H-11
C
Switch - Indicator A
D-2
C
Relay Block
H-14
B
Switch - Indicator B
D-2
C
Sender - Fuel Level
E-10
10
Switch - LH Stabilizer
E-5
A
Sender - Coolant Temperature
D-10
13
Switch - Master Steer
D-5
A
Sender - XMSN Oil Temperature
D-10
11
Switch - Oil Pressure
D-10
14
Solenoid - 1st
A-9
2
Switch - Park Brake
F-11
C
Solenoid - 2nd
A-9
2
Switch - Rear/Fog
F-5
A
Solenoid - Aux A
A-11
8
Switch - RH Stabilizer
E-5
A
Solenoid - Aux B
A-11
8
Switch - Roof Wiper/Washer
D-5
A
Solenoid - Crab
E-10
12
Switch - Service Brake
F-10
C
Solenoid - D Lock
A-10
8
Switch - Start
I-5
A
Solenoid - Div 1
A-11
8
Switch - Steer Select A
G-5
A
Solenoid - Div 2
A-11
8
Switch - Steer Select B
G-5
A
Solenoid - Div 3
A-10
8
Switch - Steering Column
C-3
A
Solenoid - E-Stop
D-10
13
Switch - XMSN Neut
E-5
A
Ground - Dash
Machine locations are repeated for components located close together. A = Located in Dash Area. B = Located under seat. C = Located in right side council
Harness And Wire Electrical Schematic Symbols
Electrical Schematic Symbols And Definitions
Component Location Component
Printed in U.S.A.
1999 Caterpillar All Rights Reserved
A
AA
Related Electrical Service Manuals Title Starter: 6V-0492
T
Form Number
Pressure Symbol
SENR3828
Temperature Symbol
Level Symbol
Flow Symbol
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
Receptacle
Plug
1 2
1 2
1
2
Typical representation of a Sure-Seal connector. The plugand receptacle contain both pins and sockets.
Pin or Socket Number Wire, Cable, or Harness Assembly Identification
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
Component Part Number
Single Wire Connector
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
C
A
A 325-PK-14
Pin
AA 1
Sender Specifications 7N-8532
Component Sender - Water Temperature
Resistance (Ohms)¹ 72-82 @ 110ºC (230ºF) 560-716 @ 54ºC (130ºF)
8I-3814
Sender - Fuel Level Sender- Transmission Oil Temperature
72-82 @ 110ºC (230ºF) 560-716 @ 54ºC (130ºF)
200-BK-14
Circuit Number Identification
33 Full 240 Empty
8I-6428
2
Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
325-PK-14
Wire Color
Socket
Normally closed switch that will open with an increase of a specific condition. Part No.
9X-1123
Wire Gauge
Electrical Schematic Symbols And Definitions
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
¹ At room temperature.
FUSE - A component in an electrical circuit that will open the circuit if too much current flows through 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.
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
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. 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.