Wire Number
Wire Color
101 102 105 109 112 113 116 118 119 120 121 123 124 127 128 129 135 136 148
RD BU BR OR PU OR BR GY PK YL YL WH GN OR PK BU BU GN WH
200 201 203 207
BK BK BK BK
302 304 306 308 309 310 311 321
OR WH GN YL GY PU WH BR
403 405 406 408 409 410 411 413
GN GY PU WH OR WH PK BR
Connectors
Wire Description Chart Description Power Distribution Circuits BAT HD LMP 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 A/C AUX CKT AUX CKT AUX CKT AUX CKT SUPPL STER AUX CKT Ground Circuits MAIN CHASSIS OPR MON PANEL CMS CHASSIS DIAGNOSTIC STARTER DIAGNOSTIC Basic Machine Circuits STARTER NO.1 RESISTOR TO DIAGNOSTIC STARTER RELAY NO.1 OUTPUT STARTER RELAY COIL TO KEY SW MAIN POWER RELAY COIL ALTERNATOR REGULATOR TERM. START AID SW TO START AID SOL START AID SOL TO TEMP SW BCKP ALARM LAMP TRAVEL ALARM Monitoring Circuits ALTERNATOR (R) TERM. OPR MON OIL PRESS. (LO SETTING) OPR MON COOLANT TEMP OPR MON SYSTEM AIR PRESS. OPR MON NEUT OPR MON ACTION ALARM OPR MON ACTION LAMP OPR MON FUEL PRESS.
Wire Color
415 417 419 428 432 433 441 442 443 447
GN GY YL OR PK BU OR GY YL PK
500 501 502 503 504 505 506 507 513 515 516 517 521 522 537
BR GN OR BR YL BU PU WH OR GY GN BU YL WH GN
603 604 605 606 607 608 614 615 617 618
PK OR YL GY PK GN PU YL BR YL
761 762 976
GY YL OR
Harness And/Or Components A - 6W4231
*
Description
Schematic Location
Connectors
Vehicle Location
B-5
6 Contacts
4
Operator Monitor (EMS)
20 Contacts
H - 9U1473
B
Diagnostic Connector A - 6W4231
A
B - 9U3475 A - 6W4231
A
C - 9V3810
10 Contacts
A - 6W4231
A
B - 9U3475 A - 6W4231 A - 6W4231
D-4
F - 8Y7088 (Attachment)
F-2
B - 9U3475
A
4 Contacts
* 6 7
Actuate
2M9346
Brake Air Pressure (Stop Lamp)
7N9560
Converter Oil Temperature (EMS)
7N9785
Engine Coolant Temperature (EMS)
7T0988
Engine Oil Pressure (EMS)
8N1693
Engine Coolant Temperature (Start Aid)
9G8009
Brake Air Pressure (EMS) Parking Brake Pressure (EMS)
9W3187
Fuel Pressure (EMS)
9X1159
Primary Steering Oil Flow (EMS)
45 kPa MAX (6.5 psi MAX) 129.4 ± 2.8°C (265 ± 5°F) 107.2 ± 2.8°C (225 ± 5°F) 62 ± 21 kPa (9.0 ± 3.0 psi) 37.8 ± 2.8°C (100 ± 5°F) 517 ± 35 kPa (75.0 ± 5.0 psi) 93 ± 21 kPa (13.5 ± 3.0 psi) 4 grams (.14 oz)
Deactuate
5 kPa MIN (0.5 psi MIN) 118.3°C MIN (245°F MIN) 91.0°C MIN (196°F MIN) 38 ± 21 kPa (5.0 ± 3.0 psi) 26.7°C MIN (80°F MIN) 448 ± 35 kPa (65.0 ± 5.0 psi) 69 ± 21 kPa (10.0 ± 3.0 psi) 1.5 grams (.05 oz.)
Normally Open Normally Closed Normally Closed Normally Open Normally Closed Normally Open Normally Closed Normally Open
Resistor and Solenoid Specifications
Component
SENR5245 April 1992
Normal Condition
Part No.
Resistance (Ohms)¹
Resistor - Alternator
6T7864
39 ± 1.95
Resistor - Blower Speed
9G1950
Overall 2.0 ± .1; Tap 1.0 ± .05
Solenoid - A/C Clutch
8T8813
14.4 ± 0.6
Solenoid - Bucket Positioner / Lift Kickout
9X5301
11.0 ± 1.1
Solenoid - Ride Control
6T8046
20.1 ± 1.0
936F Wheel Loader Electrical System
¹ At room temperature.
8AJ1-UP
Related Service Manuals Harness And/Or Components J - 6W3363
Schematic Location F-5
K - 6T4826 A - 6W4231
E-4
D - 9V4666 A - 6W4231
Title
Form No.
Alternator; Bosch K1/N1
SENR3685
Electronic Monitoring System
SENR2945
Starting And Charging Systems
SENR2947
Starting Motor; Delco Remy 37-MT/42-MT
SENR3581
F-4
Front Wiper Motor E - 8V6185
E-6
Rear Wiper Motor K - 6T4826
F-5
L - 6W3362 N - 9U2605
D-3
R - 8V6976
A-5
N - 9U2605 G - 9U2603
2
*
Off Vehicle Switch Specifications
Function
D-4
F - 8V9525
1
D-5
A-4
H - 9U1473
1
5
A-5
H - 9U1473
A
B-8
E-6
Part No.
Monitoring Circuits (Cont'd.) OPR MON TEST SW PRIMARY STER SW OPR MON PARKING BRAKE OPR MON XMSN OIL TEMP OPR MON BRAKE PRESS. (OIL) OPR MON BRAKE PRESS. (OIL) JUMPER ENG COOLANT TEMP GAGE HYD SYSTEM TEMP GAGE POWER TRAIN TEMP GAGE FUEL LEVEL GAGE Accessory Circuits WIPER - FRONT (PARK) WIPER - FRONT (LO) WIPER - FRONT (HI) WIPER - REAR (PARK) WIPER - REAR (LO) WIPER - REAR (HI) WASHER - FRONT WASHER - REAR A/C COMPRESSOR/REFRIGERANT PRESS. SW BLOWER MOTOR (HI) BLOWER MOTOR (MEDIUM) BLOWER MOTOR (LO) A/C SW TO REFRIGERANT SW A/C CLUTCH TO THERMOSTAT SW TURN SIGNAL SW TO FLASHER Lighting Circuits ROTARY BEACON STOP LAMP TURN LAMP - LEFT TURN LAMP - RIGHT FLOOD LAMP - FRONT FLOOD LAMP - REAR PARK/TAIL/DASH LAMP CAB FLOOD LAMP/ROPS TAIL/POSITION LAMP - LEFT (ROAD PKG)/WIDTH TAIL/POSITION LAMP - RIGHT (ROAD PKG)/WIDTH Control Circuits LIFT KICKOUT SOL SW BUCKET POSITIONER SOL SW RIDE CONT SOL
Harness Connector Location Chart
Vehicle Location
7 Contacts
Wire Number
D-2
N - 9U2605 H - 9U1473
C-8 M - 9U1472 Vehicle locations are repeated for connectors located close together. * = Connector is located at the component. A = Connector located in right console - access through cab air filter compartment. B = Connector located at power distribution box. 3
Vehicle Location C
3 12
2 36
3
B
11 16
22
1
28
40
21
15 13 27
35
17
32 31
34
14
8
18
26
6
4
38
7
6
33
30 5 C
23
25
10
9
2 7
A
37
29
24
20 19
39
4
5
1
15
28 B 2
31
36
35
19 22 3
11 4
26 12
16 40
A
17
23
C
1
6
32
34
1 20
6
7
5
13 21
39 18
8 27
7 2
37
33
5 30 29
9
Printed in U.S.A.
© 1992 Caterpillar All Rights Reserved
14 10
38 25 24
Component Location Chart Component Alarm - Action (EMS)
Schematic Location B-3
Vehicle Location 19
D-9
20
Sender - Fuel Level (Gauge)
C-8
Sender - Engine Coolant Temp (Gauge)
1
Alarm - Backup
2
Alternator
F-8
21
Sender - Hydraulic Temp (Gauge)
C-7
3
Battery
C-8
22
Solenoid - Air Conditioner Clutch
C-8
4
Battery
D-8
23
Solenoid - Bucket Positioner
B-3
B
Breaker - Alternator
B-8
23
Solenoid - Lift Kickout
B-3
A
Breaker - Blower Motor
D-6
24
Solenoid - Ride Control
A-3
B
Breaker - Key
B-8
25
Solenoid - Ride Control
A-2
B
Breaker - Running Lamp
B-7
26
Solenoid - Start Aid
F-8
5
Converter - Voltage
B-3
27
Switch - Backup Alarm
C-8
6
Dryer - Air
F-9
A
Switch - Beacon
C-5
7
Flasher
E-3
28
Switch - Blower
F-4
A
Fuseholder
D-6
29
Switch - Brake Air Press (EMS)
F-7
A
Gauge - Brake Air Press
D-4
30
Switch - Brake Air Press (Stop Lamp)
F-7
C
Gauge - Converter Temp
F-1
31
Switch - Brake Oil (EMS)
D-7
C
Gauge - Engine Coolant Temp
F-1
32
Switch - Brake Oil (EMS)
D-7
C
Gauge - Fuel Level
D-4, F-1
33
Switch - Bucket Positioner
A-2
C
Gauge - Hydraulic Temp
F-2
18
Switch - Converter Oil Temp (EMS)
D-8
8
Ground - Chassis
A-6
34
Switch - Disconnect
E-8
9
Ground - Engine End Frame
C-2
19
Switch - Engine Coolant Temp (EMS)
E-8
10
Ground - Loader Frame
A-2
19
Switch - Engine Coolant Temp (Start Aid)
E-7
11
Ground - Starting Motor To Engine
A-8
35
Switch - Engine Oil Press (EMS)
D-8
12
Ground - Starting Motor To Frame
A-8
A
Switch - Flood Lamp
C-5
A
Ground - To Platform
D-5
A
Switch - Front Wiper
B-6
C
Lamp - Action
D-4
36
Switch - Fuel Press (EMS)
E-8
A
Lamp - Ride Control
C-4
A
Switch - Key Start
B-4
A
Meter - Service
B-4
37
Switch - Lift Kickout
B-2
A
Monitor - Operator (EMS)
B-5
A
Switch - Operator Monitor Test (EMS)
C-6
13
Motor - Blower
E-4
38
Switch - Parking Brake Press (EMS)
D-7
13
Motor - Blower
E-5
39
Switch - Primary Steering Oil Flow (EMS)
C-7
14
Motor - Front Washer
F-3
A
Switch - Rear Flood Lamp
B-5
C
Motor - Front Wiper
F-4
A
Switch - Rear Wiper
B-6
14
Motor - Rear Washer
F-3
40
Switch - Refrigerant Press (AC)
B-8
15
Motor - Rear Wiper
E-5
A
Switch - Ride Control
C-4
16
Motor - Starting
A-8
A
Switch - Running Lamp
B-5
B
Relay - Main
B-8
28
Switch - Heater/AC Selector
F-4
B
Relay - Start
A-8
A
Switch - Start Aid
B-4
B
Resistor - Alternator
A-7
17
Switch - Thermostat
F-5
17
Resistor - Blower Speed
F-5
27
Switch - Transmission Neutral (EMS)
D-7
18
Sender - Converter Oil Temp (Gauge)
C-8
7
Switch - Turn Signal
F-3
Vehicle locations are repeated for components located close together.
C47050P1
Component
Schematic Location C-8
Harness And Wire Electrical Schematic Symbols
Electrical Schematic Symbols And Definitions A
AA
T
Pressure Symbol
Temperature Symbol
Level Symbol
Flow Symbol
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.
Pin or Socket Number Wire, Cable, or Harness Assembly Identification
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
Component Part Number
Single Wire Connector
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
C
A
A 325-PK-14
Pin
AA 1
325-PK-14
Wire Color
Socket
Normally closed switch that will open with an increase of a specific condition. 2
Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
9X-1123
200-BK-14
Circuit Number Identification
Wire Gauge
Electrical Schematic Symbols And Definitions
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.
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.
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.
A = Component located at right console. B = Component located at power distribution box. C = Component located in dash area.
This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
MACHINE HARNESS CONNECTOR AND COMPONENT LOCATIONS
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.