Harness Connector Location Chart
Wire Description Chart Wire Number
Wire Color
101 102 103 105 109 112 113 116 118 119 120 121 122 123 124 126 128 143 157 161 194
RD BU YL BR OR PU OR BR GY PK YL YL BU WH GN PK PK BR YL PK GN
200 265 270
BK BK BK
303 304 306
BR WH GN
307
OR
308 309 310 321 322 367 372
YL GY PU BR GY BU GN
405 406 415 419 441 443
GY PU GN YL OR YL
Wire Number
Description Power Distribution Circuits BAT HD LMP AUX CKT KEY SW ALT OUTPUT (+) TERM. MAIN POWER RELAY OUTPUT OPR MON PANEL B+ SWITCHED AUX CKT AUX CKT AUX CKT AUX CKT BACKUP ALARM TO LAMP AUX CKT AUX CKT A/C XMSN CONT AUX CKT AUX CKT AUX CKT AUX CKT AUX CKT Ground Circuits MAIN CHASSIS AUX AUX Basic Machine Circuits KEY SW ACC POSITION STARTER RELAY NO.1 OUTPUT STARTER RELAY COIL TO NEUT START SW OR KEY SW KEY SW TO NEUT START SW OR VMIS SENSOR MODULE MAIN POWER RELAY COIL ALTERNATOR REGULATOR TERM START AID SW TO START AID SOL BCKP ALARM LAMP TRAVEL ALARM WARNING HORN (FORWARD) WARNING HORN (REAR) STABILIZER LOCK VALVE RTN Monitoring Circuits OPR MON OIL PRESS. (LO SETTING) OPR MON COOLANT TEMP OPR MON TEST SW. OPR MON PARKING BRAKE ENG COOLANT TEMP GAGE POWER TRAIN TEMP GAGE
Wire Color
447 450 483
PK YL BR
500 501 502 503 504 505 506 513 515 516 517 520 521 522 536 552 568 576 577 A512
BR GN OR BR YL BU PU OR GY GN BU WH YL WH WH WH GN PK PU GN
603 604 605 606 607 608 610 611 614 617 618 619 620 630 634
PK OR YL GY PK GN OR PU PU BR YL GN WH GY WH
737 762 766 776
GN YL GN YL
Connectors
Description Monitoring Circuits (cont'd.) FUEL LEVEL GAGE TACH SENDER (+) BRAKE FLUID LEVEL Accessory Circuits WIPER - FRONT (PARK) WIPER - FRONT (LO) WIPER - FRONT (HI) WIPER - REAR (PARK) WIPER - REAR (LO) WIPER - REAR (HI) WASHER - FRONT A/C COMPRESSOR/REFRIGERANT PRESS SW BLOWER MOTOR (HI) BLOWER MOTOR (MEDIUM) BLOWER MOTOR (LO) OPR A/C SW TO THERMOSTAT/FUSE A/C SW TO REFRIGERANT SW A/C CLUTCH TO THERMOSTAT SW HAZARD SW TO TURN SW FOUR WHEEL DRIVE SOL WARNING BUZZER TO DIODES WIPER - AUX (LO) WIPER - AUX (HI) REAR INTERRUPT SW TO WIPER MOTOR Lighting Circuits ROTARY BEACON STOP LAMP TURN LAMP - LEFT TURN LAMP - RIGHT FLOOD LAMP - FRONT FLOOD LAMP - REAR HEAD LAMP BASIC HEAD LAMP HI PARK/TAIL/DASH LAMP TAIL/POSITION LAMP - LEFT (ROAD PKG)/WIDTH TAIL/POSITION LAMP - RIGHT (ROAD PKG)/WIDTH HEAD LAMP LO FLOOD LAMP - FRONT (ENG FLOOD LAMP) FLOOD LAMP REAR (ATTACH) HEAD LAMP SW TO WORK/HEAD LAMP JUMPER Control Circuits SWITCHING GEAR CODE 5 FRONT BUCKET POSITIONER SOL SW XMSN DISCONNECT SOL BRAKE RELEASE RELAY CONT
Machine Location
C 12 Contacts
C C 1 E
8 Contacts
D * C *
6 Contacts
* 1 E *
4 Contacts
C
Schematic Location
Harness And/Or Components
B - 9R-8619
SENR5814-01 June 2005
A-8
E - 9R-8622 E - 9R-8622
B-7
H - 9R-8623 E - 9R-8622
B-8
H - 9R-8623 D - 9R-8621
B-4
E - 9R-8622 E - 9R-8622
E-4
L - 9R-8624 E - 9R-8622
D-5
Diode As. A - 9R-9554
B-7
K - 9R-9555 A - 9R-9554
D-3
Front Wiper Motor A - 9R-9554
E-9
Rear Wiper Motor (Upper) E - 9R-8622
A-4
G - 9R-8843 E - 9R-8622
E-3
Turn/Hazard Switch E - 9R-8622
B-8
H - 9R-8623
416B, 426B, 428B, 436B And 438B Backhoe Loaders Electrical System
* = Connector is located at the component. C = Connector in right console. D = Connector in front console/dash. E = Connector in operator compartment - under floor plate.
Off Machine Switch Specifications Part No.
Function
6T2665
Coolant Temperature
9D6888
Refrigerant Pressure
Actuate 107.2 ± 2.8°C (225 ± 5°F) 234 kPa MAX (34 psi MAX)
Deactuate 93°C MIN (196°F MIN) 152 kPa MIN (22 psi MIN)
Contact Position Normally Closed Normally Open
416B: 8SG1-UP 8ZK1-UP
428B: 7EJ1-UP
438B: 3KK1-UP
426B: 5YJ1-UP 6KL1-UP
436B: 6MJ1-UP 7FL1-UP
Resistor and Solenoid Specifications Component
Part No. 8C4110
Resistance (Ohms)¹ 22 ± 1.1
Resistor - Blower Motor Speed
7T3828
Overall 1.0 ± .1; Tap 0.5 ± .05
Solenoid - A/C Clutch
3E7703
3.5 ± 0.15
Solenoid - Bucket Positioner
3E8620
21.8 ± 1.0
Solenoid - Front Drive/Trans Neutralizer
3E7507
7.7 ± .77
Resistor - Alternator
Printed in U.S.A.
© 2005 Caterpillar All Rights Reserved
¹ At room temperature.
Harness And Wire Electrical Schematic Symbols
Component Location Chart Machine
Location 9
Component
Schematic
Location 1
Alarm - Backup
Location B-9
A
Alarm - Action
D-5
10
Sender - Fuel
A-6
2
Alternator
B-1
12
Solenoid - Air Conditioner Clutch
D-1
3
Batteries
F-5
13
Solenoid - Bucket Positioner
A-4
C
Breaker - Running Lamp
B-8
14
Solenoid - Engine Shutdown
D-2
7
Coil - Start Aid
B-2
15
Solenoid - Front Drive
B-2
D
Diode As.
D-5
18E
Solenoid - Transmission Neutralizer
C-2
D
Flasher
C-7
17E
Switch - Backup Alarm/Parking Brake
C-2
C
Fuses
C-9, E-5
B
Switch - Beacon
D-7
B
Gauge - Converter Temperature
D-8
A
Switch - Blower (A/C)
E-5
B
Gauge - Coolant Temperature
D-8
A
Switch - Blower (Heater)
D-4
B
Gauge - Fuel
D-9
27
Switch - Brake Fluid Level
C-4
B
Gauge - Tachometer
D-9
20
Switch - Coolant Temperature
D-2
Sender - Coolant Temperature
Location C-1
4
Horn - Forward
A-1
22
Switch - Engine Oil Pressure
D-2
B
Meter - Service
D-8
A
Switch - Forward Horn
C-3
B
Meter - Volt
D-8
A
Switch - Front Drive
C-3
A
Motor - Blower (A/C)
E-5
B
Switch - Front Wiper
C-6
A
Motor - Blower (Heater)
C-4
B
Switch - Front Flood
E-7
A
Motor - Fan
E-7
B
Switch - Key Start
C-7
A
Motor - Front Wiper
E-3
23
Switch - Neutral/Start
C-2
A
Motor - Rear Wiper (Lower)
E-8
A
Switch - Parking Brake
D-5
A
Motor - Rear Wiper (Upper)
E-9
B
Switch - Rear Flood Lamp
E-7
5
Motor - Starter
E-2
B
Switch - Rear Lower Wiper
E-6
C
Relay - ACC
C-7
B
Switch - Rear Upper Wiper
C-6
C
Relay - A/C
B-9
26
Switch - Refrigerant
F-1
C
Relay - Cab
C-9
21
Switch - Return To Dig
D-1
C
Relay - Lamp Check
B-7
B
Switch - Running Lamp
D-6
C
Relay - Main
C-8
B
Switch - Start Aid
D-7 D-5
C
Relay - Start
B-8
A
Switch - Thermostat
C
Resistor - Alternator Field
C-7
A
Switch - Turn Signal/Hazard
E-3
A
Resistor - Blower Motor Speed (A/C)
E-5
27D
Switches - Brake (Stop Light)
D-4, E-4
A
Resistor - Blower Motor Speed (Heater)
D-4
A
Switches - Transmission Neutralizer
B-6, C-5
Electrical Schematic Symbols And Definitions
A
AA
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.
T
Pressure Symbol
3
A 1 B
5 14 22
D
27 15 18 1 8 17 23
7
Level Symbol
Flow Symbol
Pin or Socket Number
12 26 4 9
Wire, Cable, or Harness Assembly Identification
21 2 20
Component Part Number
Single Wire Connector
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
13
C
Temperature Symbol
C
A
A 325-PK-14
10
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
Pin
AA 1
9X-1123 325-PK-14
Wire Color
Socket
2
200-BK-14
Normally closed switch that will open with an increase of a specific condition. Circuit Number Identification
Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
Electrical Schematic Symbols And Definitions FUSE - A component in an electrical circuit that will open the circuit if too much current flows through it.
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
8 Sender - Converter B-2 A = Components in operator compartment. B = Components in operator compartment - right console. C = Components on relay panel (inside right console). D = Components in front console/dash. E = Components in operator compartment - under floor plate.
Wire Gauge
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.
A
No circle indicates that the wire cannot be disconnected from the component. B
D
C
1
13
27 17 18 1 8 23 10 15 3
7 14 5
4 20 9 2 22
T
12
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.
21
This indicates that the component has a wire connected to it that is connected to ground. 26
This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
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.
16 Page, Color
Component
Schematic
SENR5814-01
Machine