Wire Description Wire Number
Description
Wire Color
Power Distribution Circuits
Component Identifiers (CID¹) Module Identifier (MID²) CID No.
Component
101
RD
BATTERY
102
BU
103
YL
Description
A401
YL
ELECTRICAL SYSTEMS NO. 1 VOLTAGE
HEAD LAMP
A475
PU
OPR MON PANEL SECONDARY BRK PRESS (TUV ONLY)
AUX CKT
B412
YL
WTL PMS LIFT POS SENSOR WTL PMS LIFT CYL POS SENSOR
105
BR
KEY SWITCH
B413
PU
106
WH
AUX. CKT
B414
OR
107
WH
ENGINE SHUT DOWN
B415
PK
WTL PMS CLEAR/CHG OUT
108
BU
AUX. CKT
B416
WH
WTL PMS REWEIGH SW IN
109
OR
ALTERNATOR
B417
YL
WTL PMS STORE SW IN
WTL PMS NORM/CALIBRATE OUT
PU
MAIN POWER RELAY/OUTPUT
113
OR
OPR MON PANEL B+ SWITCHED
500
BR
WIPER- FRONT (PARK)
114
GN
WARNING HORN (FORWARD)
501
GN
WIPER- FRONT (LO)
116
BR
AUX CKT
502
OR
WIPER- FRONT (HI)
118
GY
AUX CKT
503
BR
WIPER- REAR (PARK)
120
YL
AUX CKT
504
YL
WIPER- REAR (LO)
121
YL
BACKUP ALARM TO LAMP
505
BU
WIPER- REAR (HI)
Fuel Level Sender
0100
Engine Oil Pressure Sensor
124
GN
A/C
506
BU
WASHER- FRONT
0110
Engine Coolant Temperature Sensor
126
PK
XMSN CONT
507
WH
WASHER- REAR
0168
Electrical System Voltage
127
OR
AUX CKT
508
PU
RADIO SPEAKER- LEFT
128
PK
AUX CKT
509
WH
RADIO SPEAKER- LEFT (COMMON)
0177
Power Train Oil Temperature Sensor
129
BU
AUX CKT
511
BR
RADIO SPEAKER- RIGHT
0190
Engine Speed Sensor
130
GN
AUX CKT
512
GN
RADIO SPEAKER- RIGHT (COMMON)
0248
CAT Data Link
135
BU
AUX CKT
513
OR
A/C COMPRESSOR (REFRIGERANT PRESS. SW.)
138
GN
AUTO LUBE PUMP TO PAYLOAD MON
515
GY
BLOWER MOTOR (HI)
0270
Harness Code (CMS)
144
GN
AUX CKT
516
GN
BLOWER MOTOR (MEDIUM)
0271
Action Alarm
164
WH
HYDRO CONT TO WTL POWERTRAIN CTRL
517
BU
BLOWER MOTOR (LO)
177
OR
MAIN BKR
521
YL
A/C SW TO REFRIGERANT SW
0324
Action Lamp
193
PU
AUX CKT
522
WH
A/C CLUTCH TO THERMOSTAT SW
0362
Ride Control Solenoid
GROUND CIRCUITS
537
GN
TURN SIGNAL SW TO FLASHER
200
BK
MAIN CHASSIS
538
BR
HAZARD INDICATOR
603
PK
ROTARY BEACON
0368
Auto/Manual Switch
201
BK
OPERATOR MONITOR PANEL
0600
Hydraulic Oil Temperature Sensor
202
BK
XMSN CONTROL
0601
Brake Air Pressure Sensor
203
BK
CHASSIS DIAGNOSTIC
604
OR
STOP LAMP
0617
Air Inlet Heater Relay
206
BK
BATTERY SIDE OF DISCONNECT
605
YL
TURN LAMP- LEFT
207
BK
STARTER DIAGNOSTIC
606
GY
TURN LAMP- RIGHT
0621
Downshift Switch
228
BK
FUEL LEVEL SENDER
608
GN
FLOOD LAMP- REAR
0627
Parking Brake Switch
250
BK
PAYLOAD MON- CUSTOMER GROUND
610
OR
HEAD LAMP BASIC
251
BK
PAYLOAD MON- SYSTEM GROUND
611
PU
HEAD LAMP HI
0631
Solenoid 1 (Reverse)
270
BK
CMS IDENT CODE 0
614
PU
PARK/TAIL/DASH LAMP
0632
Solenoid 2 (Forward)
271
BK
CMS IDENT CODE 1
615
YL
CAB/FLOOD LAMP/ROPS
0633
Solenoid 3 (Gear 4)
272
BK
CMS IDENT CODE 2
617
BR
TAIL/POSITION LAMP
273
BK
CMS IDENT CODE 3
619
GN
HEAD LAMP LO
274
BK
CMS IDENT CODE 4
275
BK
CMS IDENT CODE 5
710
GN
XMSN SPEED PICKUP SIGNAL
Soldnoie 4 (Gear 3)
0635
Solenoid 5 (Gear 2)
0636
Solenoid 6 (Gear 1)
0650 0668 0671
Transmission Speed Sensor
0680
BK
XMSN CONT IDENT CODE 0
720
PU
XMSN BRAKE SW
BK
XMSN CONT IDENT CODE 1
751
GN
XMSN SHIFT SOL NO. 1 OR 3
Harness Code (Transmission Control)
278
BK
XMSN CONT IDENT CODE 2
752
YL
XMSN SHIFT SOL. NO. 2
Shift Handle
279
BK
XMSN CONT IDENT CODE 3
754
BU
XMSN SHIFT SOL. NO. 3 OR 1
280
BK
XMSN CONT IDENT CODE 4
755
OR
XMSN SHIFT SOL. NO. 4 OR 5
281
BK
XMSN CONT IDENT CODE 5
761
GY
LIFT KICKOUT SOL SW
Ride Control Switch
290
BK
SERVICE
762
YL
BUCKET POSITIONER SOL SW
0685
Service Identification Code
291
BK
CLEAR
795
YL
DUAL HP SOL
292
BK
CMS US/METRIC UNITS
D743
GN
RIDE CONT- WTL IMPL CONT SW TO GND N/O
0688
Dual Horsepower Solenoid
A221
BK
TRANS CONTROL OPTIONS CODE 0
D744
WH
RIDE CONT- WTL IMPL CONT SW TO GND N/C
0596
Implement ECM
A222
BK
TRANS CONTROL OPTIONS CODE 1
E701
PK
RIDE CONT- RIDE CONT LAMP
0621
Downshift Switch
E702
OR
RIDE CONT- AUTO RIDE CONT LAMP
301
BU
STARTER NO. 1 SOL
818
BR
SERIAL DATA (TRANSMIT)
BASIC MACHINE CIRCUITS
0622
Upshift Switch
302
OR
STARTER NO. 1 RESISTOR TO DIAGNOSTIC
819
GY
SERIAL DATA (RECEIVE)
0623
Directional Switch
304
WH
STARTER RELAY NO. 1 OUTPUT
820
BU
TRANSMIT KEY
306
GN
STARTER RELAY COIL TO NEUT START SW
863
BU
PAYLOAD MON TRANSMIT LCD OUT
0631
Transmission Clutch 1 Solenoid
307
OR
KEY ST SWO TO NEUT START SW
864
BR
PAYLOAD MON CLOCK LCD OUT
0632
Transmission Clutch 2 Solenoid
308
YL
MAIN POWER RELAY COIL
865
BY
PAYLOAD MON LATCH LCD OUT
310
PU
START AID SW TO START AID SOL
900
GY
XMSN SHIFT SOL. NO. 5 OR 4
0633
Transmission Clutch 3 Solenoid
311
WH
START AID SOL TO TEMP SW
901
WH
XMSN SHIFT SOL. NO. 6
0634
Transmission Clutch 4 Solenoid
321
BR
BCKP ALARM LAMP TRAVEL ALARM
910
YL
XMSN NEUTRALIZER OVERRIDE INDICATOR
0635
Transmission Clutch 5 Solenoid
322
GY
WARNING HORN (FORWARD)
921
WH
XMSN SOL. NO. 1 OR 3 RETURN
326
PU
KEY ST SW "C" TERM.
922
BR
XMSN SOL. NO. 2 RETURN
0636
Transmission Clutch 6 Solenoid
327
PK
SHUTDOWN SOL
923
GY
XMSN SOL. NO. 3 OR 1 RETURN
0638
Starter Solenoid
924
GN
XMSN SOL. NO. 4 OR 5 RETURN
YL
XMSN SOL. NO. 5 OR 4 RETURN
MONITORING CIRCUITS GN
ALTERNATOR R TERM.
925
0650
Harness Code
405
GY
OPR MON OIL PRESS. (LO SETTING)
926
BU
XMSN SOL NO 6 RETURN
0671
Transmission Output Speed Sensor
409
OR
OPR MON NEUT
944
OR
CMS COMM +
0687
Options ID Code
410
WH
OPR MON ACTION ALARM
945
BR
CMS COMM -
411
PK
OPR MON ACTON LAMP
965
WH
TRANS SOL 1 SW TO GND
0688
Dual Horsepower Solenoid
416
OR
SUPPL STER SW
966
GY
TRANS SOL 3 SW TO GND
417
GY
PRIMARY STER SW
968
BR
TRANS SOL 2 SW TO GND
MID No.
Module
26
Computerized Monitoring System (CMS)
81
Electronic Transmission Control
¹ The CID is a diagnostic code that indicates which circuit is faulty. ² The MID is a diagnostic code that indicates which electronic control module diagnosed the fault.
419
YL
OPR MON PARKING BRAKE
969
YL
TRANS SOL 3 SW TO B+
429
YL
OPR MON BRAKE OIL TEMP
970
GN
TRANS SOL 4 SW TO GND
432
PK
OPR MON BRAKE PRESS. (OIL)
971
YL
TRANS SOL 5 SW TO GND
433
BU
OPR MON BRAKE PRESS. (OIL) JUMPER
972
BU
TRANS SOL 6 SW TO GND
439
YL
LAMP INDICATOR
973
BR
CST AUTOSHIFT- AUTO/MANUAL SW 2
440
BR
AIR PRESS. GAGE
974
PU
CST AUTOSHIFT- SLOW MODE SW
441
OR
ENG COOLANT TEMP GAGE
975
WH
CST AUTOSHIFT- SOL RETURN
442
GY
HYD SYSTEM TEMP GAGE
976
OR
RIDE CONT SOL
YL
CST AUTOSHIFT- AUTO/MANUAL SW 1
443
YL
POWER TRAIN TEMP GAGE
447
PK
FUEL LEVEL GAGE
978
GN
CST AUTOSHIFT- SLOW MODE SW 1
450
YL
TACH SENDER (+)
B999
977
GN
TRANS SOL 1 SW TO B+ (LRT ONLY)
469
GN
FUEL LEVEL SENDER B+
496
WH
OPER MON PANEL HYD OIL LEVEL
Component
Schematic Location
Machine Location
Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
Normally closed switch that will open with an increase of a specific condition.
966F Series II and 970F Wheel Loaders Electrical System 966F II: 8BG2340-2680 9YJ1078-2123 1SL507-1343
D-4
A
D-15, F-15 D-13
Alarm- Action (Monitor) Alarm- Backup Alternator Battery
F-14
Machine Location
Sensor- Lift Cyl Pressure
A-2, D-2
16
1
Sensor- Lift Position
A-2, E-2
17
2
Sensor- Trans Oil Temperature
B-14
14
3
Component
Sensor- Trans Speed
C-12
F-14
4
Shifter- Transmission
F-3
A
Breaker- Alternator (80A)
C-15
D
Solenoid- A/C Clutch
F-13
19
Breaker- Blower Motors (15A)
C-10
B
Solenoid- Engine Shutdown
E-13
20
Breaker- Engine Shutdown
C-15
D
Solenoid- Engine Shutdown/Dual HP
E-13
20
Breaker- Main (80A)
C-15
D
Solenoid- Float Detect
B-6
21
Breaker- Running Lamp (15A) Breaker- Seat Air Comp (15A)
C-15
D
Solenoid- Lift Detect
C-10
8
Solenoid- Ride Control Valve
D-1
29
Solenoid- Start Aid
Buffer- Fuel Level
B-5
21
B-2, E-1
16
A-14
8
Control- Autoshift Trans
E-12
5
Solenoid- Tilt Detect
B-6
21
Control- Engine Shutdown
C-13
D
Solenoids- Transmission Valve (6)
C-12
22
Control- Payload measurement
F-12
B
Switch- A/C Refrigerant
F-13
15
Converter- Voltage
E-8, D-6
A
Switch- A/C Thermostat
C-3
A
Display- Operator
D-3
28
Switch- Auto Ride Control
E-7
B
Flasher
E-5
C
Switch- Battery Disconnect
F-14
19
Fuses (10A)
C-10
B
Switch- Beacon
D-10
B
Fuses (10A)
C-15
D
Switch- Blower Motor
D-5
C
Horn- Forward (High Tone)
D-2
6
Switch- Breake Oil Pressure
A-13
23
Horn- Forward (Low Tone)
B-1, E-1
7
Switch- Bucket Positioner
A-1, E-1
24
Lamp- Action
D-4
C
Switch- Coolant (Ether Aid)
A-15
15
Lamp- Auto Ride Control
F-4
B
Switch- Dimmer
C-12
A
Lamp- Neutralizer Override
D-4
B
Switch- Engine Oil Pressure
A-15
Lamp- Ride Control
F-4
B
Switch- Flood Lamp
E-11
B
Lamp- Transmission Auto Mode
D-4
B
Switch- Front Intermittant Wiper
F-8
B
Meter- Service Monitor- Computerized Monitoring System (CMS) Motor- Front Washer
E-11
B
Switch- Horn
C-3
A
E-4
C
Switch- Hydraulic Oil Level
A-3
13
C-13
B
Switch- Key Start
E-9
B
B-3
C
Switch- Lift Positioner
A-2, E-1
25
Motor- Rear Washer
C-14
B
A-19
26
Motor- Rear Wiper
F-10
5
E-7
B
Motor- Front Wiper
Motor- Starter
F-14
9
Motor- Blower
C-3
10
Switch- Park Brake Pressure Switch- Payload Measurement System Reweigh Switch- Payload Measurement System Store Switch- Primary Steering
970F: 7SK224-545 9JK359-470 7PL139-195
Motor- Blower
C-3
11
B
B-14
27
Switch- Rear Wiper
E-8
B
Machine Location C
40 CONTACTS
* * C
24 CONTACTS
1 1
20 CONTACTS 14 CONTACTS
D * 2 B B
12 CONTACTS
3 3 B 4
10 CONTACTS
5 5 * 6 7
9 CONTACTS
5 5 *
Harness And/Or Components
E-5 E-4
Connectors 8 CONTACTS
E-12
5 * 6
B-5 B-7
Machine Location
8 7 CONTACTS
*
B-11
C
B-15
*
F-12 C-12
* 6 CONTACTS
3
C-10
B
D-10
9
F-10
5 CONTACTS
D-7
* *
E-8
C
B-13
10
B-3
C
B-3
*
E-3
4 CONTACTS
*
E-13
11
D-15
11
A-3 A-3
*
Harness And/Or Components A- 107-0066 Q- 107-0106 P- 106-7799 Front intermittent Wiper Switch A- 107-0066 C- 107-0107 A- 107-0086 E- 107-1007 A- 107-0066 Engine Shutdown Control F- 106-7777 Harness Code Plug RR- 103-4735 Operator Display A- 107-0066 Detent Solenoids P- 106-7779 T- 106-7780 P- 106-7779 RR- 103-4735 A- 107-0066 U- 107-0105 Customer Data Connection Operator Display (Atch) RR- 103-4735 Operator Display (Atch) P- 106-7779 S- 7X-8015 A- 107-0066 R- 9U-2771 F- 106-7777 Metric Units Speedo Plug N- 9U-2810 Rear Wiper Motor P- 106-7779 Front Wiper Motor P- 106-7779 Service Connector P- 106-7799 Transmission Options Q- 107-0106 DDD- 106-4840 AAA- 7I-3475 Fuel Level Sender
F-14
9
Switch- Running Lamp
E-10
B
C-15
D
Switch- Start Aid
E-8
B
Relay- Start
C-15
D
Switch- Stoplamp
C-12
26
Resistor- Blower Motor Speed
C-3
10
Switch- Trans Auto/Manual
D-11
B
Resistor- Starter Diagnostic
F-13
9
Switch- Trans Downshift
D-6
B
Resistor- System Voltage (CMS)
C-14
D
Switch- Trans Neutralizer
C-12
26
Sender- Fuel Level
D-1
12
Switch- Trans Neutralizer Override
E-6
B
Sensor- Engine Coolant Temp
B-15
15
Switch- Turn Signal
D-6
A
Part No.
Sensor- Engine Speed
C-12
9
Switches- Supplemental Steering
B-14
27
8T-2217
Resistor
A-3
13 9G-1950
Resistor- Blower Speed
Resistor and Solenoid Specifications Component Description
Resistance (Ohms)¹ 150.0 ± 7.5 Overall 2.00 ± .10 Tap 1.00 ±.05
102-0347
Solenoid- A/C Clutch
14.4 ± 0.6
B = Components located in operator's right side console
1W-0141
Solenoid- Engine Shutdown
5.12 ± 0.26
3E-6424
Solenoid- Engine Shutdown/Dual Horsepower
D = Located on relay panel.
6T-5859
Solenoid- Ride Control
9G-4365
Solenoid- Start Aid
3E-3748
Solenoids- Transmission
¹ At room temperature unless otherwise noted.
FMI No.
C-2
Shutdown- 4.2 ± 0.42 Dual HP- 16.1 ± 1.61 33.7 ± 1.0 6 0.5
Data valid but below normal operational range.
2
Data erratic, intermittent, or incorrect.
3
Voltage above normal or shorted high.
4
Voltage below normal or shorted low.
5
Current below normal or open circuit.
6
Current above normal or grounded circuit.
7
Mechanical system not responding properly.
8
Abnormal frequency, pulse width, or period.
9
Abnormal update.
10
Abnormal rate of change.
A-15 B-10 C-13 F-5
B-6 D-7
Data valid but above normal operational range.
1
E-9
D-3
Harness And Wire Electrical Schematic Symbols
Failure Description
0
11
Failure mode not identifiable.
12
Bad device or component.
13
Out of calibration.
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
Pin or Socket Number
Typical representation of a Sure-Seal connector. The plugand receptacle contain both pins and sockets.
Wire, Cable, or Harness Assembly Identification
¹The FMI is a diagnostic code that indicates what type of failure has occurred.
Component Part Number
Single Wire Connector
B-8
C
D-2
A
A 325-PK-14
AA 1
9X-1123 325-PK-14
D-3
Related Electrical Service Manuals
D-3
Title C-3 A-3 F-5 F-10 B-3 E-12
Pin
Wire Color
Socket
Form Number
Alternator(100-5047): Consist No. 100-5045 Consist No. 100-5046 Computerized Monitoring Systm (CMS):
SENR4130 SENR2082
2
200-BK-14
SENR5247
Electronic Transmission Control
SENR5922
Starting and Charging Systems: Starting Motor: (6V-5227) Consist No. 6V-5537 Consist No. 108-8552 Consist No. 6V-5538
SENR2947
Circuit Number Identification
SENR3581 SENR3536 SENR4975
Wire Gauge
Electrical Schematic Symbols And Definitions FUSE - A component in an electrical circuit that will open the circuit if too much current flows through it.
E-11 C-2 D-2
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.
Off Machine Switch Specification 8N-1693
A = Components located in operator's compartment. C = Components located in dash.
Printed in U.S.A.
Failure Mode Identifiers (FMI)¹
Schematic Location
Part No.
E-3
Machine Locations are repeated for connectors located close together. *- Connector is located at the component B- Connector is located in the right side console. C- Connector is located in the dash area D- Connector is located on the relay panel.
Relay- Main
Machine locations are repeated for components located close together.
Schematic Location
F- 106-7777 P- 106-7779 F- 106-7777 Monitor (CMS) P- 106-7779 Transmission Control A- 107-0066 P- 106-7779 A- 107-0066 P- 106-7779 E- 107-1007 P- 106-7799 A- 107-0066 Diagnostic Connector RR- 103-4735 Payload Monitor ECM B- 104-6727 E- 107-1007 L- 107-1944 P- 106-7779 L- 107-1944 P- 106-7779 N- 9U-2810 P- 106-7779 P- 106-7779 T- 106-7780 P- 106-7779 QQ- 102-7529 A- 107-0086 K- 107-1033 A- 107-0050 GGG- 108-0092 G- 107-0103 GGG- 108-0092 P- 106-7779 Transmission Shifter A- 107-0066 D- 108-5616 A- 107-0066 H- 9U-4371 Std A- 107-0066 GGG- 108-0092 G- 107-0103 GGG- 108-0092 P- 106-7779 Transmission Shifter
Receptacle- Auxilary Start
Sensor- Hydraulic Oil Temperature
No circle indicates that the wire cannot be disconnected from the component.
© 1995 Caterpillar All Rights Reserved
15
E-7
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
18
Battery
Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
This indicates that the component has a wire connected to it that is connected to ground.
Connectors Schematic Location
Flow Symbol
Level Symbol
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
Connector Location Component Location
Temperature Symbol
Pressure Symbol
CONTROL CIRCUITS
277
MODULE IDENTIFIER (MID)
T
LIGHTING CIRCUITS
276
403
Electrical Schematic Symbols And Definitions
ACCESSORY CIRCUITS
112
0096
0634
SENR6637-01 February 1995
MONITORING CIRCUITS (CONT.)
Function Coolant Temp (Ether Aid)
Actuate
Deactuate
Contact Position
37.8±2.8°C (100.0±5.0°F)
26.7°C MIN (60.0°F MIN)
Normally Closed
8270.0 kPa MAX (1200.0 psi MAX) 4.00 Grams MAX (0.14 oz MAX) 82.0 kPa MAX (9.0 psi MAX)
6890.0±345.0 kPa (1000.0±50.0 psi) 1.50 Grams Min (0.05 oz MIN) 38.0±20.0 kPa (5.5±3.0 psi)
Normally Closed
9W-2653
Park Brake Pressure
109-4215
Steering (Primary & Supplemental) Flow
9X-0378
Engine Oil Pressure
9X-9643
Brake Oil Pressure
10700.0 kPa MAX (1552.0 psi MAX)
6890.0±345.0 kPa (1300.0±50.0 psi)
1-2, Normally Open 1-3, Normally Closed
114-5334
Refrigerant Pressure (A/C)
275 to 1750 kPa¹ (40 to 255 psi)
-
Normally Open²
¹ With increasing pressure the closed condition can be maintained up to 2800 kPa (405psi), 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.
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.
Normally Open Normally Open
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.
20 Page, NJJ
Wire Color
SENR6637-01
Wire Number