Component Location Chart Alarm - Action
Machine Location B
Alarm - Backup
C-11
1
Solenoid - Engine Shutdown
E-2
14
Alternator
C-2
2
Solenoid - Front Drive
E-2
16E
Batteries
B-2
3
Solenoid - Hydraulic Shutoff
C-12
1
Breaker - Running Lamp
F-6
C
Solenoid - Left Steer
G-4
Coil - Start Aid
D-2
7
Solenoid - Lock (AWS)
H-4
Component
10
12
18
16
A 13
20
E
15
6
22
14
7
21
9
8
C
2
5
4
1 B
24
D 3
23
D
A
6 C
23
B
14
24 18
1
20
13
10
22
5
16
E
8
9
4
2
21 12
7
15 3
D61125
MACHINE HARNESS CONNECTOR AND COMPONENT LOCATIONS
Wire Description
Schematic Location C-12
Component Solenoid - Detent
Schematic Location A-4
Machine Location 13
SENR1211-01 January 1998
Wire Wire Description Number Color Power Distribution Circuits
Wire Wire Number Color
Description Accessory Circuits (cont'd.)
101
RD
BAT (+) (NOT APPLICATION SPECIFIC)
508
PU
RADIO SPEAKER - LEFT
102
BU
HD LMP
509
WH
RADIO SPEAKER - LEFT (COMMON)
104
YL
AUX CKT
511
BR
RADIO SPEAKER - RIGHT
105
BR
KEY SW
512
GN
RADIO SPEAKER -RIGHT (COMMON)
20
110
GN
AUX CKT
513
OR
A/C COMPRESSOR/REFRIGERANT PRESS. SW
20
111
YL
AUX CKT
515
GY
BLOWER MOTOR (HI)
Control - Shuttle
D-5
A
Solenoid - Right Steer
G-4
20
112
PU
MAIN POWER RLY OUTPUT
516
GN
BLOWER MOTOR (MEDIUM)
Diode - Assembly (AWS)
G-1
C
Solenoid - Shutoff (AWS)
H-4
20
113
OR
OPR MON PANEL VMIS B+ SWITCHED
517
BU
BLOWER MOTOR (LO)
Diode - Assembly
C-10
B
Solenoid - Sideshift Lock
C-12
18
115
PK
AUX CKT
520
WH
OPR A/C SW TO THERMOSTAT/FUSE
116
BR
AUX CKT
521
YL
A/C SW TO REFRIGERANT SW
Flasher
F-6
C
Solenoid - XSMN Control FWD
E-2
16E
118
GY
AUX CKT
522
WH
A/C CLUTCH TO THERMOSTAT SW
Fuses
E-5
C
Solenoid - XSMN Control REV
E-2
16E
119
PK
AUX CKT
536
WH
HAZARD SW TO TURN SW
Fuses
E-9
D
Suppressor - Arc (AWS)
H-3
C
121
YL
BCKP ALARM TO LAMP
537
GN
TURN SIGNAL SW TO FLASHER
Gauge - AWS Position
H-2
C
Suppressor - Arc
G-7
12
122
BU
AUX CKT
552
WH
FOUR WHEEL DRIVE SOL
Gauge - Converter Temperature
D-11
B
Switch - AWD
E-3
C
123
WH
AUX CKT
564
GY
REAR WIPER INTERRUPT SW TO WIPER SW
Gauge - Coolant Temperature
D-11
B
Switch - AWS Mode Selector
H-2
C
124
GN
A/C
568
GN
WARNING BUZZER TO DIODES
128
PK
AUX CKT
Gauge - Fuel
D-11
B
Switch - AWS Pressure
H-3
13
130
GN
AUX CKT
602
WH
DOME LAMP
Gauge - Tachometer
Lighting Circuits
D-11
B
Switch - Beacon
E-8
D
136
GN
SUPPL STER
603
PK
ROTARY BEACON
Ground - Engine
F-2
8
Switch - Blower (A/C)
H-8
A
140
BU
AUX CKT
604
OR
STOP LAMP
Horn - Forward
A-1
4
Switch - Blower (Heater)
D-10
B
143
BR
AUX CKT
605
YL
TURN LAMP - LEFT
144
GN
AUX CKT
606
GY
TURN LAMP - RIGHT
157
YL
AUX CKT
607
PK
FLOOD LAMP - FRONT FLOOD LAMP - REAR
Horn - Rear
C-12
Indicators - Warning Lightbar
C-11
Indicators - Warning Lightbar
E-3
Meter - Service
C-11
Motor - Blower (A/C) Motor - Blower (Heater) Motor - Fan Assembly
1
Switch - Brake
C-5
A
B
Switch - Brake Fluid Level
C-2
6
161
PK
AUX CKT
608
GN
C
Switch - Coolant Temperature
D-2
9
170
YL
AUX CKT
610
OR
HEAD LAMP BASIC
B
Switch - Headlamp/Flood Lamp
D-8
D
194
GN
AUX CKT
611
PU
HEAD LAMP HI
H-8
A
Switch - Coupler
D-3
C
197
GN
AUX CKT
614
PU
PARK/TAIL/DASH LAMP
E-11
A
Switch - Coupler Aux. Hydraulic
C-3
C
198
PK
AUX CKT
617
BR
TAIL/POSITION LAMP - LEFT (ROAD PKG)/WIDTH
F-11
A
Switch - Dimmer
E-3
C
618
YL
TAIL/POSITION LAMP - RIGHT (ROAD PKG)/WIDTH
200
BK
MAIN CHASSIS
619
GN
HEAD LAMP LO
Motor - Front Washer
B-2
6
Switch - Engine Oil Pressure
D-2
22
201
BK
OPR MON PANEL
620
WH
FLOOD LAMP - FRONT (ENG. FLOOD LAMP)
Motor - Rear Washer
B-2
6
Switch - Fan
F-11
A
202
BK
XMSN CTRL
630
GY
FLOOD LAMP REAR (ATTACH)
Motor - Front Wiper
F-4
A
Switch - Forward Horn
C-3
C
265
BK
ELECTRONIC PUMP CTRL IDENT CODE 2
634
WH
HEAD LAMP SW TO WORK/HEAD LAMP JUMPER
270
BK
CMS IDENT CODE 0 752
YL
XMSN SHIFT SOL NO. 2
Motor - Rear Wiper
E-11
A
Switch - Front Roading
D-8
D
Motor - Starter
C-2
5
Switch - Front Wiper
E-9
D
Relay - A/C
D-6
C
Switch - Hazard
E-3
C
Relay - ACC
E-5
C
Switch - Hydraulic Shutoff
B-10
B
Relay - Cab
E-6
C
Switch - Key Start
A-11
B
Relay - Drop Valve
E-6
C
Switch - Neutral Lock
D-3
C
Relay - Left Steer
H-1
C
Switch - Parking Brake
D-10
B
Relay - Main
D-5
C
Switch - Rear Flood Lamp
E-8
D
Relay - Right Steer
G-1
C
Switch - Rear Horn
B-11
B
Relay - Shutoff
G-1
C
Switch - Rear Steer
H-3
C
Relay - Start
E-6
C
Switch - Rear Wiper
F-9
D
Relay - Lamp Test
B-11
B
Switch - Refrigerant Pressure
H-7
12
Resistor - Blower Motor Speed (A/C)
H-8
B
Switch - Return To Dig
D-1
21
Resistor - Blower Motor Speed (Heater)
D-11
B
Switch - Sideshift Lock
B-10
B
Sender - Converter
E-2
8
Switch - Stabilizer Leg
B-12
23
Sender - Coolant Temperature
D-2
9
Switch - Start Aid
A-10
B
Sender - Fuel
F-6
10
Switch - Thermostat
G-8
A
Sensor - Position (AWS)
G-4
20
Switch - Turn Signal
F-3
C
Solenoid - Air Conditioner Clutch
G-7
12
Switch - Washer
F-8
D
Solenoid - Bucket Positioner
A-5
13
Switch - Transmission Neutralizer
A-4, C-2, H-4
15
Solenoid - Circle Steer
H-4
20
Machine locations are repeated for components located close together.
416C, 426C, 428C, 436C, 438C Backhoe Loaders With European Cab Electrical System 416C: 5YN1-3799 1BR1-648 1LR1-415 1XR1-683
426C: 7WN1-438 1ER1-363 1NR1-453 1ZR1-425
436C: 9JN1-383 1GR1-415 1RR1-497 2BR1-410
428C: 8RN1-1628 1HR1-402 1SR1-422 2CR1-4427
438C: 9KN1-560 1JR1-606 1TR1-782 2DR1-1049
Ground Circuits
Control Circuits
Basic Machine Circuits 303
BR
KEY SW ACC POSITION
754
BU
XMSN SHIFT SOL NO.3 OR 1
304
WH
STARTER RL Y NO.1 OUTPUT
762 766
YL GN
BUCKET POSITIONER SOL SW XMSN DISCONNECT SOL
306
GN
307
OR
STARTER RLY COIL TO NEUT START SW OR KEY SW KEY SW TO NEUT START SW
779
WH
COUPLER ENGAGE SOL
C720
BU
RELAY INTERLOCK
308
YL
MAIN POWER RL Y COIL
E764
OR
SOL 1 TO SW 1 GLB
309
GY
ALT REGULATOR TERM.
G726
GY
RELAY TO SOL
310
PU
START AID SW TO START AID SOL
G742
GN
RELAY COIL TO DIODE
321
BR
BCKP ALARM LAMP TRAVEL ALARM
G743
OR
RELAY COIL TO DIODE
322
GY
WARNING HORN (FORWARD)
G789
BR
MODE SW TO PRESS SW
367
BU
WARNING HORN - REAR
G795
OR
AWS MODE SW TO REAR STEER SW
Monitoring Circuits
G796
YL
AWS MODE SW TO REAR STEER SW SW TO RELAY COIL
405
GY
OPR MON OIL PRESS. (LO SETTING)
G797
BU
406
PU
OPR MON COOLANT TEMP
G798
PU
SW TO RELAY COIL
415
GN
OPR MON TEST SW
H767
BR
AWS SOL GND
419
YL
OPR MON PARKING BRAKE
H768
BR
AWS SOL GND
429
YL
OPR MON BRAKE OIL TEMP
H769
BR
AWS SOL GND
441
OR
ENG COOLANT TEMP GAGE
H770
BR
AWS SOL GND
441
OR
ENG COOLANT TEMP GAGE
H771
BR
SIDE SHIFT LOCK SOL
443
YL
POWER TRAIN TEMP GAGE
H772
YL
BACKHOE SHUTOFF SOL
447
PK
FUEL LEVEL GAGE
F871
PU
L/S STRG JUMPER
450
YL
TACH SENDER (+)
F872
BU
R/S STRG JUMPER
483
BR
BRAKE FLUID LEVEL
F874
PK
SWITCH TO TIMER INPUT
F877
WH
SWITCH TO RELAY 1
922
BR
XMSN SOL NO 2 RETURN XMSN SOL NO 3 OR 1 RETURN
Accessory Circuits
A = Components in operator compartment.
D = Components in right side headliner.
500
BR
WIPER - FRONT (PARK)
B = Components in operator compartment - right console.
E = Components under floor plate in operator compartment.
501
GN
WIPER - FRONT (LO)
923
GY
502
OR
WIPER - FRONT (HI)
C993
WH
NEUTRAL SWITCH
503
BR
WIPER - REAR (PARK)
L998
OR
AUX HYD SOL B
C = Components in front console/dash.
504
YL
WIPER - REAR (LO)
L999
GN
AUX HYD SOL C
505
BU
WIPER - REAR (HI)
M913
PU
DIODE TO INDICATOR LAMP
506
PU
WASHER-FRONT
M968
BU
COUPLER SWITCH INTERCONNECT
507
WH
WASHER-REAR
M969
YL
COUPLER SWITCH INTERCONNECT
Printed in U.S.A.
© 1998 Caterpillar All Rights Reserved
Harness And Wire Electrical Schematic Symbols A
Connector Location ¹ Machine Location
CONN 1
A-3
E
CONN 2
B-3
E
CONN 3
B-3
E
CONN 4
B-3
E
2
Resistor and Solenoid Specifications Component
CONN 5
B-3
E
Part No.
Resistance (Ohms)¹
CONN 6
C-3
E
Resistor - Blower Motor Speed
7T-3828
Overall 1.00 ± .10; Tap 0.50 ± .05
CONN 7
E-4
C
Sender - Fuel Level
128-2875
CONN 8
E-4
C
CONN 9
F-4
C
CONN 10
A-6
D
Solenoid - A/C Clutch
3E-1907
Solenoid - AWS Steer
113-5320
8.48
Solenoid - Bucket Positioner/Detent
3E-8620
21.8 ± 1.0
A-6
D
CONN 12
C-5
C
Solenoid - Front Drive
3E-7507
7.7 ± .77
CONN 13
C-6
C
Solenoid - Hydraulic Shutoff
131-3078
5.0 ± 0.3
8C-5541
5.0 ± 0.3
CONN 14
C-6
C
Solenoid - Lift
CONN 15
C-6
C
Solenoid - Lock
129-4531
10.5
CONN 16
C-8
D
Solenoid - Quick Coupler
127-9173
3.56
CONN 17
B-10
B
Solenoid - Sideshift Lock/Quick Coupler
3E-8622
10.5
CONN 18
C-10
B
CONN 19
D-10
B
CONN 20
G-8
B
CONN 21
G-8
E
CONN 22
H-3
E
CONN 23
G-3
24
CONN 24
G-3
E
CONN 25
G-2
E
G-1
C
CONN 27
G-1
C
CONN 28
F-12
18
CONN 29
B-12
1
CONN 30 B-12 1 ¹ 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.
Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.
T
Pressure Symbol
Temperature Symbol
Level Symbol
Flow Symbol
Pin or Socket Number
Empty - 240-260 Full - 27.5-39.5 3.5 ± 0.15
CONN 11
CONN 26
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
Receptacle
Plug
1 2
1 2
1
Schematic Location
Connector Number
AA
Electrical Schematic Symbols And Definitions
Wire, Cable, or Harness Assembly Identification
Component Part Number
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
Single Wire Connector C
A
A 325-PK-14
Pin
AA 1
9X-1123 325-PK-14
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
Wire Color
Socket
¹ At room temperature.
Normally closed switch that will open with an increase of a specific condition. 2
Circuit Number Identification
Off Machine Switch Specifications Part No.
Function
6T-2665
Coolant Temperature
114-5333
Refrigerant Pressure (A/C)
Actuate
Deactuate
107.2 ± 2.8°C (225.0 ± 5.0°F) 275 to 1750 kPa ¹ (40 to 255 psi)
93°C MIN (196°F MIN) -
200-BK-14
Normal 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.
Normally Closed
Electrical Schematic Symbols And Definitions
Normally Open ²
A-C Normally Closed Below 551 kPa Max 344 ± 20 kPa Deactuation Pressure 128-5091 AWS Pressure (80 psi) (50 ± 3 psi) A-B Normally Open Below Deactuation Pressure ¹ A hysteresis band exists: with increasing pressure the closed condition can be maintained up to 2800 kPa (405 psi), with decreasing pressure the closed condition can be maintained down to 170 kPa (25 psi). ² Contact position at the contacts of the harness connector.
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. 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.