Wire Number
Wire Color
101
RD
102
Wire Description Wire Number
Wire Color
Bat (+)
508
PU
Radio Speaker - Left
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)
110
GN
Aux Ckt
513
OR
A/C Compressor/Refrigerant Press. Sw
111
YL
Aux Ckt
515
GY
Blower Motor (Hi)
112
PU
Main Power Rly Output
516
GN
Blower Motor (Medium)
113
OR
Opr Mon Panel B+ Switched
517
BU
Blower Motor (Lo)
115
PK
Aux Ckt
520
WH
Opr A/C Sw to Thermostat/Fuse
116
BR
Aux Ckt
521
YL
A/C Sw to Refrinerant Sw
118
GY
Aux Ckt
522
WH
A/C Clutch to Thermostat Sw
119
PK
Aux Ckt
536
WH
Hazard Sw to Turn Sw
121
YL
Bckp Alarm to Lamp
537
GN
Turn Signal Sw to Flasher
122
BU
Aux Ckt
552
WH
Four Wheel Drive Sol
123
WH
Aux Ckt
564
GY
Rear Wiper Interrupt Sw to Wiper Sw
124
GN
A/C
568
GN
Warning Buzzer to Diodes
128
PK
Aux Ckt
C558
BU
Front Wiper Switch Jumper
130
GN
Aux Ckt
C559
GN
Rear Wiper Switch Jumper
140
BU
Aux Ckt
143
BR
Aux Ckt
602
WH
Dome Lamp
144
GN
Aux Ckt
603
PK
Rotary Beacon
157
YL
Aux Ckt
604
OR
Stop Lamp
161
PK
Aux Ckt
605
YL
Turn Lamp - Left
170
YL
Aux Ckt
606
GY
Turn Lamp - Right
194
GN
Aux Ckt
607
PK
Flood Lamp - Front
197
GN
Aux Ckt
608
GN
Flood Lamp - Rear
198
PK
Aux Ckt
614
PU
Park/Tail/Dash Lamp
620
WH
Flood Lamp - Front (Eng. Flood Lamp)
630
GY
Flood Lamp Rear (Attach)
Description Power Circuits
SENR1212-01 January 1998
Description Accessory Circuits (Continued)
Related Electrical Service Manuals Title
Part No.
Lighting Circuits
Ground Circuits 200
BK
Main Chassis
201
BK
Opr Mon Panel CMS
202
BK
XMSN Ctrl
303
BR
Key Sw Acc Position
304
WH
306
Form Number
Axle, Differential, and Brakes (All Wheel Steer)
SENR1205
Resistor, Sender and Solenoid Specifications Component Description
Resistance (Ohms)¹
3E-9362
A/C Relay, Accy, Cab, Lamp Test, Main, Start
90 ± 9
3E-7572
Relay - Left/Right Steer, Shutoff
7T-3828
Resistor - A/C Blower
3E-8622
Solenoid - Shutoff, Valve Gp
10.5
129-4531
Solenoid - Lock
10.5
3E-7507
Solenoid - Front Drive
113-5320
Solenoid - Circle Steer, Left Steer, Right Steer
8.5
3E-8620
Solenoid - Aux Detent, Bucket Position
32.1
3E-1907
A/C Clutch
160 Overall - 1.0 ± .1 Tap - .5 ± .05
7.7 ± .77
3.5 ± .15
¹ At room temperature unless otherwise noted.
Control Circuits 752
YL
XMSN Shift Sol No.2
754
BU
XMSN Shift Sol No.3 or 1
762
YL
Bucket Positioner Sol Sw
Starter Rly No.1 Output
766
GN
XMSN Disconnect Sol
GN
Starter Rly Coil to Neut Start Sw or Key Sw
779
WH
Coupler Engage Sol
307
OR
Key Sw to Neut Start Sw
C720
BU
Relay Interlock
308
YL
Main Power Rly Coil
E764
OR
Sol 1 to Sw 1
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
G795
OR
AWS Mode Sw to Rear Steer Sw
Basic Machine Circuits
Monitoring Circuits
Part No.
Off Machine Switch Specification
Function
6T-2665
Engine Coolant Temperature
114-5333
Refrigerant Pressure (AC)
Actuate
Deactuate
Contact Position
107.2 ± 2.8°C (225 ± 5°F)
93°C MIN (196°F MIN)
Normally Open
275 to 1750 kPa ¹ (40 to 255 psi)
— —
Normally Open ²
128-5091
Pressure
551 kPa (36.3 psi)
344 kPa ± 20 kPa (49.9 psi ± 2.9 psi)
Normally Closed (Contacts A-C Below Deactuation Press) Normally Open (Contacts A-C Below Deactuation Press)
9X-5446
Thermo
.25 Nm to .43 Nm (.19 ft lb to.32ftlb)
— —
Normally Open
405
GY
Opr Mon Oil Press. (Lo Setting)
G796
YL
AWS Mode Sw to Rear Steer Sw
406
PU
Opr Mon Coolant Temp
G797
BU
Sw to Relay Coil
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 (25psi).
415
GN
Opr Mon Test Sw
G798
PU
Sw to Relay Coil
² Contact postion at the contacts of the harness connector.
419
YL
Opr Mon Parking Brake
H767
BR
AWS Sol Gnd
429
YL
Opr Mon Brake Oil Temp
H768
BR
AWS Sol Gnd
441
OR
Eng Coolant Temp Gauge
H769
BR
AWS Sol Gnd
443
YL
Power Train Temp Gauge
H770
BR
AWS Sol Gnd
447
PK
Fuel Level Gauge
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
BR
XMSN Sol No 2 Return
Accessory Circuits 500
BR
Wiper - Front (Park)
922
501
GN
Wiper - Front (Lo)
923
GY
XMSN Sol No 3 or 1 Return
502
OR
Wiper - Front (Hi)
C993
WH
Neutral Switch
503
BR
Wiper - Rear (Park)
L998
OR
Aux Hyd Sol B
504
YL
Wiper - Rear (Lo)
L999
GN
Aux Hyd Sol C
505
BU
Wiper - Rear (Hi)
M913
PU
Diode to Indicator Lamp
M968
BU
Coupler Switch Interconnect
416C, 426C, and 436C Backhoe Loader Electrical System 416C: 4ZN1-5634 1AR1-648 1KR1-415 1WR1-2946
426C: 6XN1-1244 1CR1-363 1MR1-455 1YR1-516
436C: 8TN1-390 1FR1-415 1PR1-597 2AR1-603
Harness And Wire Electrical Schematic Symbols
Alarm - Backup Alarm - Park Brake Alternator Arc Suppressor (A/C) Arc Suppressor.A (AWS) Arc Suppressor.D (AWS)
Connector Location
Schematic Location
Machine Location
CONN 1
B-11
A
CONN 2
C-11
A
CONN 3
C-11
A
CONN 4
B-10
D
CONN 5
B-10
D
CONN 6
C-10
CONN 7
C-9
CONN 8
Connector Number
Component Location Machine Location 1
Component Service Meter
Schematic Location C-12
Machine Location A
B-14
A
Solenoid - A/C Clutch
H-11
15
D-2
2
Solenoid - Aux Detent
A-5
16
G-11
9
Solenoid - Bucket Position
A-7
16
I-4
B
Solenoid - Circle Steer
H-6
14
I-5
B
Solenoid - Engine Shutdown
E-2
18
Battery
C-2
3
Solenoid - Front Drive
E-3
19
Breaker - Running Lamp
F-8
A
Solenoid - Left Steer
H-6
14
Coil - Start Aid
D-3
10
Solenoid - Lock
H-6
14
Control - Shuttle
D-6
F
Solenoid - Right Steer
G-6
14
Control Gp - Electronic
C-14
A
Solenoid - Shutoff
H-6
14
Diode Assembly (AWS)
G-2
B
Starter
C-3
20
Flasher
F-8
B
Switch - A/C Blower
H-11
A
Fuses
E-9, E-8
E
Switch - Aux Coupler
B-4
B
Fuses
1-9, 1-8
D
Switch - Aux Front Floods
F-10
D
Fuses
E-12, F-12
D
Switch - Aux Rear Floods
F-9
D
Gauge - AWS Position
H-2
B
Switch - AWD
D-4
B
D
Gauge - Converter Temp
B-13
A
Switch - AWS Mode Select
I-2
B
B
Gauge - Coolant Temp
B-12
A
Switch - Beacon
E-10
D
C-8
B
CONN 9
C-8
B
Gauge - Fuel Level
C-13
A
Switch - Brake Fluid Level
C-3
21
CONN 10
C-7
B
Ground - Engine
F-3
11
Switch - Coolant
E-3
12
CONN 11
D-6
B
Horn - Forward
B-3
5
Switch - Coupler
C-4
B
CONN 12
E-6
B
Lamp - Beacon
A-11
6
Switch - Engine Oil Pressure
E-3
22
CONN 13
E-6
B
Lamp - Dome
G-11
C
Switch - Front Floods
G-10
D
CONN 14
A-4
19
Lamp - Indicator
I-3
A
Switch - Front Wiper
D-10
D
CONN 15
B-4
19
Lightbar
D-13
A
Switch - Hazard
E-4
B
CONN 16
B-4
19
CONN 17
C-4
19
Lightbar - Action
E-4
B
Switch - Heater
A-13
A
CONN 18
H-5
23
Motor - A/C Blower
H-13
7
Switch - Horn
B-4
B
CONN 19
H-4
19
Motor - Fan Assembly
E-14
8
Switch - Orops Aux Front Floods
H-7
D
CONN 20
I-4
19
Motor - Front Wiper
F-5
C
Switch - Orops Beacon
G-7
D
CONN 21
H-2
B
Motor - Rear Wiper
D-14
4
Switch - Orops Front Floods
I-7
D
CONN 22
H-2
B
Radio
H-14
C
Switch - Orops Rear Floods
G-7
D
Relay - A/C
F-7
B
Switch - Park Brake
A-5
A
Relay - Accessory
E-7
E
Switch - Rear Floods
E-10
D
Relay - Cab
D-7
E
Switch - Rear Steer
I-5
B
Relay - Lamp Test
D-12
A
Switch - Rear Wiper
C-10
D
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.
Relay - Left Steer
H-1
B
Switch - Refrigerant
Relay - Main
E-7
E
Switch - RTD (Bucket Positioner)
H-11
9
I-11
13
Relay - Right Steer
H-1
B
Switch - Start
B-14
A
Relay - Shutoff
H-1
B
Switch - Start Aid
C-14
A
Relay - Start
D-7
E
Switch - Thermo
G-12
B
Resistor - A/C Blower
H-12
A
Switch - Turn Signal
E-4
B
Sender - Converter
F-3
11
Switch - XMSN Neutral
C-3
23
Sender - Coolant
D-3
12
Switch - XMSN Neutral
I-5
23
Sender - Fuel
F-4
13
Switch - XMSN Neutral Lock
D-4
B
Sensor - Rear Steering Position
G-6
14
Tachometer
C-13
A
Sensor - RTD (Bucket Positioner)
I-12
17
Machine location are repeated for components located close together A = Operator Compartment - Right Console
D = Operator Compartment - Right Overhead Console
B = Operator Compartment - Front Dash
E = Operator Compartment - Steering Column Top Panel
C = Operator Compartment - Front Overhead Console
F = Operator Compartment
1 Receptacle
Plug 13
16
4 7
14
6
1
F
C
23
E
B
21 8
22 10
12
20
2
5
* C-C4* AG-C3 130-6795 130-6795
17
D
Wire, Cable, or Harness Assembly Identification
Pin or Socket Number
9
15
18
11
24 A
3
Pin
D
* Harness identification letter(s) and a serializing code. The "C" stands for connector and the number indicates which connector in the harness.
C
1
E
B
14
13
11
17
20
19 16
Flow Symbol
Harness identification code This example indicates wire 32 in harness "L'.
Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
200-L32 BK-14
2 Circuit Number Identification
Wire Color
Normally closed switch that will open with an increase of a specific condition.
Wire Gauge
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
Electrical Schematic Symbols And Definitions
8 24
Level Symbol
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
21
FUSE - A component in an electrical circuit that will open the circuit if too much current flows through it.
A
1
Temperature Symbol
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
4 F
T
Pressure Symbol
9X-1123
Socket
Single Wire Connector 6
L-C12* 3E-5179
AG-C4* 111-7898 325-A135 PK-14
7
Component Part Number
2
19
Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
L-C12 * 3E-5179
AG-C4 * 111-7898
Electrical Schematic Symbols And Definitions
1 2
1 2
Part Numbers For Connector Assembly
325-L25 PK-14
Component
Schematic Location B-15
Printed in U.S.A.
© 1998 Caterpillar All Rights Reserved
10
18 22
2
12 5 15
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.
9
23 3
D74859
Machine Harness Connector And Component Locations
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.
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.