KENR9015 November 2008
Wire Description Wire Number
Wire Color
Battery (+)
515
GY
HVAC Blower Motor #1 (High)
RD
Head Lamps
516
GN
HVAC Blower Motor #1 (Medium)
103
RD
Battery (+)
517
BU
HVAC Blower Motor #1 (Low)
104
RD
Horn Relay
518
OR
Switch To Hazard Flasher
105
RD
Key Switch
521
YL
Fan Speed Switch To A/C Press Sw
111
RD
Brake Lamps
522
WH
A/C Clutch To Thermostat Switch
112 115
PU RD
Main Power Relay Output Accessory Socket
537
GN
Turn Signal Switch To Flasher
552
WH
All Wheel Drive Solenoid
116
BR
Rear Flood Lamp
564
GY
Rear Wiper Interrupt Switch To Wiper Switch
117
YL
Rear Flood Lamp ATCH
568
GN
Park Brake Alarm Signal
118
GY
Front Wiper Motor
119
PK
Rear Wiper Motor
569 590
PK GY
A/C Switch Jumper #2 Intermittent Wiper Switch
122
BU
Heater A/C Switch
C511
WH
Relay Power
123
WH
Fuel Pump
C568
WH
HVAC Blower Motor (Max)
124
GN
HVAC
E528
PU
HVAC On/Off Switch To Blower Speed Sw
133
OR
Monitoring
E529
YL
Blower Switch Jumper
RD
102
Accessory Circuits (Continued)
Power Circuits
CONN TO PLATFORM HARNESS (RH-C15)
CONN TO PLATFORM HARNESS (RH-C13)
NOT USED ON MECHANICAL MACHINE
Lighting Circuits
143
BR
Implement Disable
144
GN
Beacon
601
GY
Backlamps
146
GY
PRM Module 1
603
PK
Rotary Beacon Lamp #1
157
YL
Front Flood ATCH
604
OR
Stop Lamps
158
BR
Front Flood
605
YL
Turn Lamps - Left
159
BU
Turn Signal
606
GY
Turn Lamps - Right
161
RD
Hazard Lamp
607
PK
Flood Lamps - Front #1
180
GN
Operator Seat Ground Circuits
608
GN
Flood Lamps - Rear #1
610
OR
Headlamps - Basic
200
BK
Main Chassis
611
PU
Headlamps - High Beam
202
BK
Control
614
PU
Tail / Position / Dash Lamps
218
BK
Transmission Id Code 1
617
BR
Tail / Position Lamp - Left
265 A250
BK BK
Electronic Control MSS Indicator (Return)
618
YL
Tail / Position Lamp - Right
619
GN
Headlamps - Low Beam
620
WH
Flood Lamps - Engine Fog Lamps
Basic Machine Circuits
CONN TO PLATFORM HARNESS (RH-C12)
CONN TO REAR WORK LAMP CONN TO FRONT WORK LAMP
304
WH
Starter Relay #1 Output
627
YL
306
GN
Key Switch To Starter Relay
630
GY
307
OR
Key Switch To Neutral Start Switch
308
YL
Main Power Relay Coil
702
OR
CONN TO RIGHT TURN-IND
CONN TO GROUND TERMINAL
CONN TO GROUND TERMINAL
CONN TO IMMOBILISER HARNESS
CONN TO LEFT TURN-IND CONN TO CONTROL GP-XMSN
CONN TO SW AS. HAZARD
CONN TO AWD ITALY SW JUMPER CONN TO LOAD CHECK DISABLE HARNESS CONN TO ROADING LIGHTS HARN CONN TO PROD LINK HARNESS
Flood Lamps - Rear Attachment #1 Control Circuits On Brake Switch (LH)
309
GY
Alternator Regulator
720
PU
On Brake Switch (RH)
310
PU
Start Aid Switch To Start Aid Solenoid
752
YL
Transmission Forward Solenoid
320
OR
Horn Switch To Horn Relay
754
BU
Transmission Reverse Solenoid
322
GY
Forward Warning Horn
762
YL
Bucket Positioner Solenoid Switch
324
BU
Differential Lock Solenoid
766
GN
Transmission Disconnect Solenoid
327
PK
Engine Shutdown Solenoid
911
YL
All Wheel Drive Relay (Signal)
330
YL
Neutral Start Relay
976
OR
Ride Control Pressure Switch
333
GN
Fuel Shut Off Solenoid
E727
BU
Neutral Lock Alarm Relay
367
BU
Rear Warning Horn
E917
WH
Implement Lockout Switch (N.O.)
384 A305
BU YL
Glow Plugs Horn Power To Relay
E918
GN
Implement Lockout Switch (N.C)
E991
GY
Unused Connector
A346
BU
MSS - Signal
F420
GN
Indicator - Warning
A347
GN
MSS - Diode
F739
GN
Active Ride Control Switch (N.C.)
F846
PU
MSS Led Driver (Red)
403
GN
Alternator 'R' Terminal - Engine #1
G423
PK
High Pressure Implement Filter 2
404
YL
Unused Sensor Connector
G703
GN
Load Check Solenoid Return
405
GY
Engine Oil Pressure Switch (Low)
G763
PU
Neutral Lock Alarm Relay
406
PU
Coolant Temperature
G848
GN
MSS Led Driver 2
419
YL
Parking Brake Sensor
G981
PU
Stabilizer Warning Horn
420
OR
Air Filter
H771
BR
Sideshift Lock Solenoid
432
PK
Brake Oil Pressure
J764
BR
8V Sensor Return
439
YL
Indicator - Lamp (Water in Fuel)
J881
YL
Transmisson Control State (Return)
441
OR
Coolant Temperature Gage
M719
GN
Sideshift Left Switch
447
PK
Fuel Level Gage
M720
BU
Sideshift Left Relay
450
YL
Tachometer Signal
M721
WH
Sideshift Right Switch
452
PU
M936
BR
Flow Control Switch
M937
GN
Flow Control Proximity Switch
500
BR
Wiper - Front (Park)
N939
GN
Ride Control Solenoid
501
GN
Wiper - Front (Low)
N945
OR
AWD Signal
502
OR
Wiper - Front (High)
N957
PK
RXD - Comm 1
503
BR
Wiper - Rear (Park)
N960
OR
TXD - Comm 1
506
PU
Washer - Front
N970
YL
DTR - Comm 1
507
WH
Washer - Rear
N973
BR
DCD - Comm 1
508
PU
Radio Speaker - Left (+)
509
WH
Radio Speaker - Left (-)
N979 P915
GN PK
Signal Ground - Comm 1 Neutral Lock Indicator
Monitoring Circuits
VIEW OF SIDE CONSOLE HARNESS (RH)
Description
Torque Converter Oil Temperature Accessory Circuits
422E and 428E Backhoe Loader Electrical System Volume 1 - Component Location Schematic Location
Machine Location
Alarm, Stabilizer
G-11
A
Control, FNR Shift Handle
G-8
1
Diode, Fuel Lift Pump
B-5
Diode, Neutral Lock Alarm
Schematic Location
Machine Location
Suppresser, Stabilizer Alarm Arc #1
G-13
A
Suppresser, Stabilizer Alarm Arc #2
G-13
A
B
Switch, AWD
H-7
2
B-7
B
Switch, Beacon
D-13
A
Flasher
D-5
B
Switch, Brake LH
H-8
2
Meter, Service
I-7
2
Switch, Brake RH
G-8
2
Component
Component
Module, PRM #1
I-5
A
Switch, Differential Lock
H-8
6
Module, PRM #2
I -4
A
Switch, Front Work Lamp
D-13
A
Module, PRM HVAC
I-4
A
Switch, Hazard
F-8
1
Motor, Operator Seat
G-3
3
Switch, Horn
B-13
2
Port, Power
E-11
A
Switch, Key
B-14
A A
Relay, AWD
G-5
B
Switch, Loader Handle Neutralizer
G -3
Relay, Fuel Lift Pump
C -5
B
Switch, Parking Brake
E-11
A
Relay, Forward Horn
H -5
B
Switch, Rear Fog Lamp
C-13
A
Relay, Low Side Control
D-5
B
Switch, Rear Wiper
C-13
A
Relay, Neutral
D-5
B
Switch, Rear Work Lamp
D-13
A 7
Relay, Neutral Lock Alarm
B-5
B
Switch, Return To Dig
F-2
Relay, Neutral Start
C -5
B
Switch, Ride Control
G-7
2
Relay, Park Brake Alarm
B-5
B
Switch, Ride Control Pressure
H-1
4
Relay, Rear Horn
G-5
B
Switch, Roading
G-7
2
Relay, Ride Control
F-5
B
Switch, Side Shift Lock
E-13
A
Sensor, Bucket Position
F-2
4
Switch, Stabilizer LH Leg Up
G-13
A
Solenoid, Return To Dig
F-3
A
Switch, Stabilizer RH Leg Up
G-13
A
Solenoid, Ride Control #1
H-1
5
Switch, Stalk
Solenoid, Ride Control #2 Suppresser, Ride Control Arc
H -1 H-1
5 5
Switch, Start Aid Switch, XSMN Handle Neutralizer Switch, XSMN Lock
F-8 to G-8
2
B-13
A
B-3
2
I-7
2
DXC1-UP DSK1-UP
Volume 1 of 2: Cab
Machine locations are repeated for components located close together. A = Located inside of side console.
© 2008 Caterpillar, All Rights Reserved
Printed in U.S.A.
B = Located on fuse and PRM bracket.
Harness And Wire Electrical Schematic Symbols
511
BR
Radio Speaker - Right (+)
R912
OR
Hydraulic Pedal Lock Solenoid
512
GN
Radio Speaker - Right (-)
X750
OR
Forward/Reverse Solenoid return
513
OR
A/C Refrigerant Pressure Switch
X752
GY
Reverse Solenoid
X977
YL
Fuel Pump (+)
Symbols
T
Pressure Symbol
Temperature Symbol
Level Symbol
Circuit Breaker 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.
VIEW OF AREA A CONN TO AUX POWER PORT
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.
CONN TO SIDE CONSOLE HARN (PL-C42)
Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine.
CONN TO SIDE CONSOLE HARN (PL-C2)
CONN TO STABILISER ALARM
Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
CONN TO LOADER NEUTRALISER SW
CONN TO LH BRAKE SW
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.
CONN TO ROOF HARNESS CONN TO RH BRAKE SW
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
CONN TO SIDE CONSOLE HARN (PL-C13)
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.
CONN TO ENGINE HARNESS
A
CONN TO DIFF LOCK
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.
CONN TO HVAC HARNESS
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.
CONN TO STABILISER DIODE 1
CONN TO STABILISER DIODE 2
CONN TO LH STAB LEG UP SWITCH
Harness and Wire Symbols Deutsch connector: Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
1 2
CONN TO RH STAB LEG UP SWITCH SECURE XMSN NEUTRAL SW CONN AND RIDE CONTROL CONN
Harness Identification Letter(s): (A, B, C, ..., AA, AB, AC, ...)
Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes
CONN TO REAR END HARNESS
C-C4 130-6795
CONN TO ELECTRIC SEAT
Part Number for Connector Plug
AG-C3 130-6795
Harness Connector Serialization Code: The "C" stands for "Connector" and the number indicates which connector in the harness. (C1, C2, C3, .....)
Pin
Socket
L-C12 3E-5179
AG-C4 111-7898
Part Number For Connector Recepticle
1
325-AG135 PK-14
CONN TO RTN TO DIG SOL
Sure-Seal connector: Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.
1 2
5A
Receptacle
CONN TO XMSN NEUTRALISER SWITCH
Pin or Socket Number
Single Wire Connector
9X-1123
Component Part Number
Plug
2
Harness identification code: This example indicates wire 135 in harness "AG".
2
CONN TO POWER SIDE SHIFT HARNESS
1
Ground Connection
200-L32 BK-14 Circuit Identification Number
Wire Color
5
VIEW OF PLATFORM HARNESS (PL) B
A
9
3 8
POSITION FOR BACKUP ALARM RELAY OPTION
11
7
6
4
REAR HORN RELAY
10
FORWARD HORN RELAY CONN TO PARKBRAKE
POSITION FOR AWD RELAY OPTION
Related Electrical Service Manuals Title Electric Starting Motor:
Form Number 143-0539
SENR3828
POSITION FOR RIDE CONTROL RELAY OPTION CONN TO PRM 1 RING TERMINAL
RELAY AND FUSE BLOCK TO BE MOUNTED IN TOP SLOT OF BRACKET
CONN TO PRM 1 RING TERMINAL
LANYARD FROM FUSE/RELAY BLOCK TO BE SECURED TO THIS HOLE
CONN TO PRM 2 RING TERMINAL
Volume 1 - Connector Location Connector Number
FUSE BLOCK TO BE MOUNTED IN BOTTOM SLOT OF BRACKET
6
LANYARD FROM FUSE BLOCK TO BE SECURED TO THIS HOLE
2 7
11
3
4
5
1
CONN TO FLASHER RELAY 5 POS RELAY BLOCK
9
A B
10 8
Schematic Location
Machine Location
CONN 1
H-13
A
CONN 2
H-13
A
CONN 3
I-13
A
CONN 4
I-13
A
CONN 5
H-13
A
CONN 6
C-11
A
CONN 7
D-11
A
CONN 8
E-11
A
CONN 9
E-3
8
CONN 10
E-3
8
CONN 11
F-3
11
CONN 12
F-3
8
CONN 13
H-3
8
CONN 14
I-3
9
CONN 15
J-3
10
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.
CONN TO PRM 3 2 POS AMPSEAL PLUG CONN TO PRM 2
CONN TO PRM 1
NOTE: FUSE & RELAY BOXES SHOWN WITH COVERS REMOVED
Machine Connector & Component Locations FRONT VIEW OF FUSE AND PRM BRACKET
Fuse (5 Amps)
Wire Gauge
(Dimensions: 48 inches x 35 inches)
101
Description
36 Page,
Wire Color
KENR9015 VOL 1 of 2
CONN TO REAR HORN SWITCH CONN TO KEY SWITCH
Wire Number