Schematic Location
Component
Connector Location¹
Schematic Location
Machine Location
CONN 1
A-15
1
CONN 2
A-14
1
CONN 3
B-14, C-14, E-14
1
CONN 4
A-13
1
CONN 5
A-13
1
CONN 6
B-12
15
CONN 7
B-12
15
CONN 8
D-12
17
CONN 9
C-11
17
CONN 10
C-11
17
CONN 11
D-11
17
CONN 12
H-11
C
CONN 13
B-8
19
CONN 14
B-8
19
CONN 15
B-8
19
CONN 16
B-8
19
CONN 17
D-8
19
CONN 18
F-8
19
CONN 19
H-8
19
CONN 20
A-6
C
CONN 21
I-3, I-5, H-3
19
CONN 22
B-4
A
CONN 23
D-2
18
CONN 24
E-2, F-2, G-2
18
CONN 25
F-2, G-2
18
Connector Number
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.
Component Location
Machine Location
Component
Schematic Location
Machine Location
RENR3404 June 1999
Alarm - Backup
C-12
1
Solenoid - FWS
E-10
12
Alarm - High Coolant Temperature
F-10
C
Solenoid - High
A-9
2
Alternator
D-11
3
Solenoid - LH O/R Down
A-11
8
Assembly - Gauge
A-3
A
Solenoid - LH O/R Up
A-12
8
Assembly - Fan
I-1
5
Solenoid - Rev
A-9
2
Batteries
D-11
2
Solenoid - RH O/R Down
A-11
8
Control - Boom
F-13
C
Solenoid - RH O/R Up
A-12
8
Control - XMSN
A-7
A
Solenoid - Tele Out
A-10
8
Flasher
I-14
B
Solenoid - Tilt 1
A-10
8
Fuse Block
G-14
B
Solenoid - Tilt 2
A-10
8
Fuse Block
F-14
B
Solenoids - Frame Level
C-11
9
Ground - Chassis
A-14
16
Switch - Aux
C-5
A
F-3
A
Switch - Beacon
E-5
A
Grounds - Subframe
B-10
15
Switch - Boom Control
H-12
C
Heater
D-12
B
Switch - Brake Pedal
E-7
6
Indicator Display
H-12
A
Switch - Cold Start
D-5
A
Motor - Front Washer
E-10
2
Switch - Diff Lock
F-5
A
Motor - Front Wiper
E-1
A
Switch - Flood Lamp
C-5
A
7
Motor - Heater Assembly
G-10
C
Switch - Flood Lamp TUV
H-4
A
A
Motor - Roof Washer
E-10
2
Switch - Frame Level
G-11
C
Motor - Roof Wiper
H-2
7
Switch - Hazard Warning
G-5
A
Motor -Starter
D-12
4
Switch - Head Flood Lamp TUV
I-4
A
Relay - Cold Start
D-11
2
Switch - Headlamp/Side
F-5
A
Relay - Main
I-15
B
Switch - Headlamp/Side TUV
I-4
A
Relay - Start
E-11
2
Switch - Heater
G-11
C 13
Ground - Dash
Relay - XMSN Neutralizing
I-15
B
Switch - High Cool Temperature
D-10
Relay Block
H-11
C
Switch - Horn
E-3
A
Relay Block
H-14
B
Switch - Indicator
D-2
C
Sender - Fuel Level
E-10
10
Switch - LH Stabilizer
E-5
A
Sender - Water 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-10
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
Solenoid - Fwd
A-9
9
8
2
14
13 5
11
17 3
4
1
16
18
12 C
19 B
10
6 16
TH62, TH63, TH82, and TH83 Electrical System 4TM1235-1852 4TM1854-1949 4TM1951-1955 5WM1588-2719 5WM2721-2843
7
A
2
9
Machine locations are repeated for components located close together.
14
B 11 16 2
3KN439-UP 3LN750-935 3LN939-UP 3NN784-UP 3RN1072-1838
3RN1840-1958 3RN1964-1978 3RN1981-2029 3RN2031-2049 3RN2051-2055
18
3
6 12
5
13
C
5WM2848-2932 5WM2934-3045 5WM3048-3054 3JN579-702 3JN705-719
4
10 8
19
1
17 15
A = Located in dash area.
Related Electrical Service Manuals Title Starter: 6V-0492
Form Number
B = Located under seat. C = Located in right hand console.
E90562
SENR3828
Machine Harness And Component Locations
Wire Number
Wire Color
101
RD
102 103
Wire Description
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
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
115
PK
Stabilizer Switches
A546
BU
Boom Ctrl Sw to Aux A Relay (coil)
116
BR
Frame Level Sw
A547
OR
Boom Ctrl Sw to Aux B Relay (coil)
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
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
144
GN
Beacon Sw
617
BR
Tail/Position Lamp - Left & Plate Lamp
147
PU
Lockout Rely (contact) to Stab Fuse and Frame Level Fuse
618
YL
Tail/Position Lamp - Right
157
YL
Haz Warn Sw (Turn Sig Ckt)
619
GN
Head Lamp Lo
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
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)
727
GN
Prox Sw (Load) to Steer Relay (coil)
Description Power Distribution Circuits
Description Accessory Circuits (cont'd)
A
AA
Off Machine Switch Specification Part No. 6T-2665
Function
Actuate
High Cool Temperature
Deactuate
Contact Position
107 ± 2.8 ºC
93 ºC MIN
Normally
(225 ± 5.0 ºC)
(196 ºF MIN)
Closed
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
Receptacle
Plug 2
WH
Starter Relay Output
728
BU
Prox Sw (Supply) to Steer Relay (contact)
306
GN
Neut Start Relay (contact) to Start Relay (coil)
751
GN
XMSN High Sol
Typical representation of a Sure-Seal connector. The plugand receptacle contain both pins and sockets.
Component Part Number
Single Wire Connector C
A
A 325-PK-14
Pin
AA 1
9X-1123 325-PK-14
Wire Color
Socket
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
317
YL
Start Aid Relay To Start Aid Sol
762
YL
Lockout Relay to Boom Sensor
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
327
PK
Func Lock Sw to Tilt Sol, Lockout Relay (contact)
B754
GN
Frame Level Sw to Sol
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
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
Monitoring Circuits
J760
YL
RH O/R Down Sol Return
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
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
2
Sender Specifications Component
7N-8532
Sender - Water Temperature
8I-3814
Sender - Fuel Level
Resistance (Ohms)¹
Temperature Symbol
Level Symbol
Flow Symbol
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.
Wire Gauge
Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
33 Full
Electrical Schematic Symbols And Definitions
240 Empty Sender - Transmission Oil Temperature
Pressure Symbol
200-BK-14
Circuit Number Identification
72-82 @ 110 °C (230 °F) 560-716 @ 54 °C (130 °F)
8I-6428
T
Pin or Socket Number Wire, Cable, or Harness Assembly Identification
Part No.
Electrical Schematic Symbols And Definitions
1 2
1 2
1
Control Circuits
304
Accessory Circuits
Harness And Wire Electrical Schematic Symbols
Lighting Circuits
Ground Circuits Basic Machine Circuits
Printed in U.S.A.
© 1999 Caterpillar All Rights Reserved
72-82 @ 110 °C (230 °F) 560-716 @ 54 °C (130 °F)
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
FUSE - A component in an electrical circuit that will open the circuit if too much current flows through it.
¹ At room temperature.
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.
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.