307 EXCAVATOR ELECTRICAL SYSTEM

Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Actuator - Engine Governor F-5 1B
Sender - Engine Coolant Temperature
B-9 36
Alarm - Fault F-2 2A
Sender - Hydraulic Oil Temperature
B-6 37
Alarm - Action B-6 3
Sensor - Fuel Level
A-6 38
Alternator B-9 4
Solenoid - Air Conditioner Compress Clutch
B-S 39
Antenna E-9 5
Solenoid - Blade
B-6 40D
Battery A-3 6
Solenoid - Engine Shutdown
B-9 41
Breaker - Alternator J-8 7C
Solenoid - Engine Pump Control
B-6 42D
Controller F-5 8B
Solenoid - Travel Speed
B-6 43D
Converter J-9 70C
Solenoid - Trenching
A-6 44D
Fuse - Block J-4, 5, 6 9F
Switch - Cab Heater
F-6 46B
Horn C-2 10
Switch - Coolant Temperature
B-9 47
Lamp - Boom C-2 11
Switch- Disconnect
A-3 71
Lamp-Cab G-1,H-1 12
Switch - Engine Oil Press
A-9 48
Lamp - Chassis B-2 13
Switch - Fuel Air Bleed
D-1 49E
Lamp - Dome D-5 14
Switch - Horn
H-2 50
Lighter - Cigar F-2 15A
Switch - Light (Chassis/Boom Lamp)
E-1 51E
Meter - Service F-2 16A
Switch - Light (Cab Lamp)
J-3 52C
Monitor F-1 17A
Switch - Neutral Start
H-2 53
Motor- Starter A-9 18
Switch - One Touch Low Idle
F-4 54
Motor - Washer C-7 19
Switch - Power Mode
E-2 55E
Motor-Wiper J-1 20
Switch - Press
B-7 56
Plug-Glow B-9 21
Switch - Refrigerant Low Press
C-7 58
Pump - Fuel A-5 22
Switch - Starter
F-4 59B
Relay - Air Conditioner H-5 25F
Switch - Travel Alarm Cancel
H-3 60C
Relay - Blade Lock H-6 26F
Switch - Travel Press
B-7 61
Relay - Cab Lamp H-5 27F
Switch - Travel Speed
E-2 62E
Relay - Chassis/Boom Lamp H-6 28F
Switch - Washer
E-1 63E
Relay - Governor H-5 29F
Switch - Wiper
E-1 64E
Relay - Heater H-8 30C
Switch - Work Mode
E-2 65E
Relay - Horn H-5 31F
Timer - Engine Shutdown
F-6 66B
Relay - Neutral Start H-5 32F
Timer - Travel Alarm
J-9 67C
Relay - Safety F-6 33B
Unit - Air Conditioner
E-7 68
Relay - Starter J-8 34C
Unit - Heater
F-7 69
Relay - Wiper H-6 35F
Area A = Inside of monitor panel
Area B = Inside of R.H. console
Area C = Inside of L.H. console
Area D = Around pilot manifold
Area E = Monitor switch
Area F = Inside of fuse relay box
Harness Connector Location Chart
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
17 Contacts
CONN46
D - 125-4728
Monitor
F-1
CONN51
D - 125- 4728
Work Mode Switch
D-2
CONN1
B- 125-4723
C - 125- 4725
D-4
CONN52
D - 125- 4728
Washer Switch
D-2
CONN2
C - 125- 4725
F-125-4818
D-8
CONN53
D - 125- 4728
Air Bleed Switch
D-2
CONN3
C - 125- 4725
D- 125-4728
D-8
CONN13
C - 125-4725
Heater Unit
E-7
CONN5
C - 125- 4725
D - 125-4728
E-8
CONN39
Y-5I-8217
Wiper Motor
J-1
CONN22
A - 125-4724
C - 125- 4725
G-8
CONN10
H - 125- 4799
Converter
J-9
CONN25
C - 125- 4725
H -125- 4799
H-7
CONN15
C-125-4725
Engine Shutdown Timer
E-6
CONN27
C - 125- 4725
J - 125-4803
G-5
CONN17
C - 125- 4725
Cab Heater Switch
F-6
CONN28
C - 125-4725
J- 125-4803
G-5
CONN7
B - 125-4723
C -125- 4725
D-4
8 Contacts
CONN20
C - 125-4725
K - 125-4730
E-5
CONN8
A - 125-4724
C - 125- 4725
G-8
CONN4
C - 125- 4725
D - 125-4728
D-8
CONN9
H - 125-4799
Converter
J-9
CONN18
C - 125- 4725
Controller
F-5
CONN24
A - 125-4724
Travel Pressure Switch
B-1
CONN26
C- 125-4725
J - 125-4803
G-5
CONN30
Z - 125 - 1780
Refrigerant Low Pressure Switch
C-7
CONN29
C- 125-4725
J- 125-4803
G-4
CONN31
Z - 125- 1780
Air Conditioner Compress Clutch
B-8
CONN12
Z - 125- 1780
Air Conditioner Unit
E-7
CONN35
H -125- 4799
Travel Alarm Cancel Switch
H-3
CONN16
C - 125- 4725
Safety Relay
F-6
CONN36
H -125- 4799
Cab Lamp Switch
J-3
CONN19
Engine Governor Actuator
Controller
F-5
CONN37
C -125- 4725
G - 7Y - 3868
H-2
CONN40
E- 125-4817
Y-5I-8217
G-2
CONN45
D -125- 4728
ActionAlarm
F-2
CONN11
C - 125- 4725
H - 125- 4799
H-8
CONN56
B - 125 -4723
M - 111 -4755
C-3
CONN23
H - 125- 4799
Travel Alarm Timer
J-9
CONN56
B - 125 -4723
L - 111 -4754
C-3
CONN47
D- 125-4728
Travel Speed Switch
E-2
CONN56
B - 125-4723
N - 105-9946
C-3
CONN48
D - 125- 4728
Chassis/Boom Lamp Switch
E-2
CONN59
B - 125-4723
Fuel Level Sensor
A-6
CONN49
D - 125- 4728
Power Mode Switch
E-2
CONN60
B - 125-4723
Trenching Solenoid
A-6
CONN50
D - 125- 4728
Wiper Switch
E-2
CONN61
B - 125-4723
Engine/Pump Control Solenoid
B-6
Harness Connector Location Chart
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
CONN62
B - 125-4723
Travel Speed Solenoid
B-6
CONN42
P-106-0024
Cab Lamp
G-1
CONN63
B-125-4723
Travel Alarm
B-6
CONN43
E-125-4817
P-106-0024
H-1
CONN64
B - 125-4723
Blade Solenoid
B-6
CONN44
P-106-0024
Cab Lamp
H-1
CONN65
A-125-4724
Pressure Switch
B-7
CON N54
M-111-4755
Boom Lamp
C-2
CONN6
E-125-4817
F-125-4818
D-8
CONN54
L-111-4754
Boom Lamp
C-2
CONN14
C-125-4722
Engine Shutdown Timer
E-6
CONN54
N-105-9946
Boom Lamp
C-2
CONN21
K-125-4730
Low Idle Switch
F-4
CONN55
M-111-4755
Boom Lamp
C-2
CONN32
J-125-4803 J-4
CONN57
B-125-4723
Chassis Lamp
B-3
CONN33
J-125-4803
Z-125-1780
H-4
CONN58
B-125-4723
Fuel Pump
A-5
CONN38
G-7Y-3868
Horn Switch
H-2
CONN69
A-125-4724
Engine Oil Press Switch
A-8
CONN41
E-125-4817
P-106-0024
G-1
Bullet
Terminal
5 Contacts
4 Contacts
3 Contacts
2 Contacts
10 Contacts
7 Contacts
6 Contacts
5 Contacts
2 Contacts
Bullet
Terminal
1
2
3
4
1
2
3
4
6
7
8
10
11
13
14
17
18
19
20
64 63 49
6562
60
67
9
10
25
26
27
28
29
30
31
32
35
34
7
70
F
42
43
44
51
52
55
3
4
5
58
6
68 69
61
10
11
12
14
13
18
19
20
21
22
37
36
38
71
39
41
47
48
50
53
54
56
3
4
58
6
68 69
61
10
11
11
12
12
14
13
18
19
20
21
22
37
36
38
71
39
41
47
48
50
53
54
56
A
B
C
D
1
33
2
35
4
3
34
5
6
7
8
16
17
18
19
20
21
22
23
24
25
26
2728
29
30
31
32
1
2
3
4
5
6
7
8
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
33
31
32
35
34
AREA C
AREA F
AREA E
AREA D
3070791
3070790 3070789
1
16
10
6
7
17
14
2
3
1
5
11
20
4
8
4
10
4
19
13
6
2
7
3
A
A
A
B
B
C
C
C
B
B
B
C
C
B
B
C
C
A
A
A
8
4
5
7
1
18
9
3
A
A
B
B
34
35
17
22
19
18
8
7
C
C
C
1
9
26
27
28
24
4
3
C
D
D
A
C
A
2
23
1
21
12
8
2
10
11
6
5
D
D
A
B
B
C
C
C
6
2
3
30
31
32
33
29
25
20
A AA
1
2
325-PK-14
200-BK-14
T
This indicates that the component does not have a wire connected to ground. It is
grounded by being fastened to the machine.
This indicates that the component has a wire connected to it that is connected to ground.
105-9344
T
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
Pin
Socket
Fuse
Component
Part Number
Pin or Socket
Number
Receptacle
Plug
Wire Gauge
Wire, Cable, or Harness
Assembly Identification
Wire Color
Normally closed switch that will open with an increase of a specific condition.
No circle indicates that the wire cannot be disconnected from the component.
Single Wire
Connector
Circuit Number
Identification
Ground
Connection
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Circuit Breaker
Symbol
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.
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.
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.
Harness And Wire Symbols
Electrical Schematic Symbols And Definitions
1
1
2
2
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.
©
1995 Caterpillar
All Rights Reserved
Printed in U.S.A.
SENR9209
September 1995
307 Excavator Electrical System
2PM257-UP
1
2
3
4
5
6
7
8
9
10
12
1
2
3
4
5
6
7
8
9
10
11
8
59
15
16
E
1
2
17
66
33
46
AREA A
AREA B
3070787
Z
Z
327-PK-14
101-RD-6
A A
A
A
A
A
A
A
A
AA
DD
A
A A
A
A
A
A
A
2
1
1
2
GN
MOTBAT
A
S
CHASSIS
MOTOR
L
E
B
P
R
ALT
GLOW PLUG
099-7529
ALTERNATOR
085-9411
COOLANT TEMP SENDER
095-3757
STARTER
085-9096
112-0106 (NOTE C)
CONN 34
5I-6587
405-GY-18
T
MOTOR
SHUTDOWN SOL
112-0188
200-BK-18
190-PK-18
D814-GY-18
405-GY-18
406-PU-18
441-OR-18
BK
L15
309-GY-18
304-WH-8
ATCH
A/C CLUTCH SOL
105-9362
406-PU-18
403-GN-18
109-OR-6
D746-PK-18
200-BK
877-YL-8
327-PK-14
441-OR-18
309-GY-18
GN
BK
1
2
ATCH
TRAVEL
PRESS. SW
102-8041
200-BK-6
405-GY-18
201-BK-18
817-WH-18
GN
403-GN-18
PRESS. SW
102-8041
109-OR-6
200-BK-18
406-PU-18
BKBK
D746-PK-18
BK-18
200-BK-18
441-OR-18
D746-PK-18
200-BK-6
BK-18
WASHER
096-0486
109-OR-6
CHASSIS
200-BK-18
200-BK
304-WH-8877-YL-8
309-GY-18
101-RD-6327-PK-14
200-BK-18
327-PK-14
200-BK
201-BK-18
877-YL-8
817-WH-18
304-WH-8
BK-0
304-WH-8
403-GN-18
101-RD-6
200-BK-18
200-BK-18
D746-PK-18
101-RD-6
T
877-YL-8
D814-GY-18
COOLANT TEMP SW
085-5121
RD-0
201-BK-18
GN
200-BK-6
RD-0
190-PK-18
506-PU-18
L15
GN
REFRIGERANT SW
105-9344 (NOTE A)
A
ENGINE
ENGINE OIL PRESS. SW
ENGINE
ATCH A/C
FE
135-BU-18
210-BK-18
CD
D C
6
7
8
9
5
4
3
2
1
10
6
7
8
9
5
4
3
2
1
10
10
1
2
3
4
5
9
8
7
6
CD
616-BU-18
763-BU-18
792-OR-18
D816-WH-18
C
C
515-GY-18
124-GN-18
Lo
BU/WH517-BU-18
118-GY
501-GN
500-BR
615-YL
L16
L16
Z
L13
L13
Me
Hi
791-PK-18
103-YL-18
7
6
5
4
D815-PU-18
403-GN-18
330-YL-18
3
2
1
D816-WH-18
763-BU-18
B965-GY-18
323-WH-18
447-PK-18
442-GY-18
615-YL
129-BU-18
168-GN-18
113-OR-18
142-BU-18
108-BU-18
616-BU-18
501-GN
791-PK-18
792-OR-18
500-BR
118-GY
877-YL-18
506-PU-18
103-YL-18
441-OR-18
406-PU-18
405-GY-18
200-BK
GN
L12
L11
TO RADIO
ATCH
A/C UNIT
105-9597
135-BU-18
210-BK-18
BU/YL
103-YL-18
BU/BK
BU/RD
200-BK
615-YL
500-BR
501-GN
118-GY
200-BK
200-BK
447-PK-18
406-PU-18
B965-GY-18
142-BU-18
442-GY-18
200-BK
200-BK
ANTENNA
111-4761
ATCH
HEATER UNIT
125-1506
405-GY-18
406-PU-18
441-OR-18
MOTOR
103-YL-18
506-PU-18
135-BU-18
210-BK-18
L9
877-YL-18
L4
L15
129-BU-18
403-GN-18
168-GN-18
118-GY
500-BR
792-OR-18
791-PK-18
501-GN
616-BU-18
108-BU-18
142-BU-18
113-OR-18
506-PU-18
168-GN-18
129-BU-18
108-BU-18
615-YL
L4
210-BK-18
135-BU-18
442-GY-18
447-PK-18
GN
BK
RD
323-WH-18
B965-GY-18
763-BU-18
D816-WH-18
330-YL-18
403-GN-18
D815-PU-18
330-YL-18
877-YL-18
113-OR-18
405-GY-18
441-OR-18
200-BK
323-WH-18
D815-PU-18
135-BU-18
L15
OPERATOR STATION
210-BK-18
D813-OR-18
B786-BU-18
K
K
PLATFORM
200-BK-18
200-BK
200-BK-18
200-BK-18
200-BK-18
124-GN-18
200-BK-18
D746-PK-18
330-YL-18
309-GY-18
309-GY-18
403-GN-18
200-BK-18
330-YL-18
403-GN-18
200-BK-18
332-BU-18
327-PK-14
107-WH-14
D813-OR-18
B786-BU-18
D815-PU-18
D814-GY-18
190-PK
200-BK
200-BK-18
332-BU-18
309-GY-18
B786-BU-18
D813-OR-18
D814-GY-18
405-GY-18
406-PU-18
441-OR-18
309-GY-18
403-GN-18
D746-PK-18
103-YL-18
327-PK-14
506-PU-18
330-YL-18
877-YL-18
107-WH-14
118-GY
500-BR
792-OR-18
791-PK-18
501-GN
124-GN-18
616-BU-18
108-BU-18
142-BU-18
113-OR-18
168-GN-18
129-BU-18
190-PK
615-YL
C
CONN 14
200-BK-18
200-BK
190-PK
D814-GY-18
D815-PU-18
B786-BU-18
D813-OR-18
107-WH-14
327-PK-14
332-BU-18
200-BK-18
403-GN-18
330-YL-18
200-BK-18
403-GN-18
309-GY-18
BK
309-GY-18
330-YL-18
D746-PK-18
E
BU/WH
C
C
C
K
10
1
2
3
4
5
9
8
7
6
615-YL
190-PK
129-BU-18
168-GN-18
113-OR-18
142-BU-18
108-BU-18
616-BU-18
124-GN-18
501-GN
791-PK-18
792-OR-18
500-BR
118-GY
107-WH-14
877-YL-18
330-YL-18
506-PU-18
327-PK-14
103-YL-18
D746-PK-18
403-GN-18
309-GY-18
441-OR-18
406-PU-18
405-GY-18
D814-GY-18
C
200-BK-18
200-BK-18
332-BU-18
124-GN-18
BK-20
GN-20
BU-14
1
2
3
4
RD-14
5
D746-PK-18
330-YL-18
309-GY-18
309-GY-18
6
200-BK-18
+ BATTERY
403-GN-18
GND
515-GY-18
SOLENOID
ON (KEY)
200-BK-18
330-YL-18
403-GN-18
ENG SHUTDOWN
TIMER
105-9979
SAFETY RELAY
094-2080
327-PK-14
517-BU-18
500-BR
118-GY
501-GN
105-BR-14
200-BK-18
112-PU-14
200-BK-18
200-BK
200-BK-18
200-BK-18
200-BK
CAB
8
L
M
B
WH/BU
YL
BK
WH/YL
WH/GN
OPERATOR STATION
M
B
107-WH-14
P
L
R
442-GY-18
447-PK-18
323-WH-18
B965-GY-18
763-BU-18
D816-WH-18
321-BR-18
607-PK-18
322-GY-18
D813-OR-18
B786-BU-18
C
332-BU-18
309-GY-18
S
GROUND
310-PU-18
307-OR-18
112-PU-14
6
2
1
5
D816-WH-18
105-BR-14
763-BU-18
B965-GY-18
7
616-BU
200-BK-18
322-GY-18
607-PK-18
323-WH-18
447-PK-18
442-GY-18
WH
574-WH-18
616-BU
CONTROLLER
102-8019
KNOB
7Y-9390
ENG GOV ACTR
126-2944
KEY SW
7Y-3918
OFF
PREHEATBR
R1
B
C
R2
ACC
START
ON
L13
L13
L10
L12
L10
L4
L9 L9
C
E
L11
135-BU-18
210-BK-18
515-GY-18
517-BU-18
OR
200-BK-18
YL
BK
574-WH-18
321-BR-18
B
C
PK
2
1
C
200-BK
200-BK
200-BK
103-YL-18
200-BK
615-YL
105-BR-14
L8
307-OR-18
135-BU-18
210-BK-18
GN
310-PU-18
307-OR-18
309-GY-18
DOME LAMP
096-0721
310-PU-18
D813-OR-18
309-GY-18
B786-BU-18
112-PU-14
D815-PU-18
6
5
4
2
1
3
332-BU-18
B786-BU-18
4
3
7
K
D813-OR-18
D814-GY-18
332-BU-18
190-PK
200-BK
200-BK-18
L3
ONE TOUCH
LOW IDLE SW
6I-5088
L5
L3
BU/BK
ATCH
KNOB
105-9976
ATCH
CAB HEATER SW
099-6220
RD
BK
YL
WH
D
D
D
DD
D
D
D
D
D
D
D
200-BK-18
200-BK-18
323-WH-18
168-GN-18
616-BU-18
200-BK-18
200-BK-18
791-PK-18
108-BU-18
506-PU-18
D815-PU-18
410-WH-18
201-BK-18
616-BU-18
442-GY-18
2
4
5
3
1
616-BU-18
WH
YL
BK
BU
2
1
5
4
3
BU
BK
YL
RD
OPERATOR STATION
201-BK-18
2
1
5
4
616-BU-18
3
3
2
1
5
4
616-BU-18
8
3
ILLUMI4
COOLANT TEMP SENDER
HYD OIL TEMP SENDER
ONE TOUCH LOW IDLE
2
3
MONITOR
121-1116
6
9
10
11
5
7
CIGAR
LIGHTER
9W-0335
410-WH-18
200-BK-18
BK
RD1
2
3E-6328
AIR
BLEED SW
121-1121
129-BU-18
441-OR-18
200-BK-18
200-BK-18
B965-GY-18
142-BU-18
200-BK-18
200-BK-18
616-BU-18
616-BU-18
406-PU-18
405-GY-18
330-YL-18
877-YL-18
200-BK
200-BK-18
403-GN-18
D815-PU-18
442-GY-18
441-OR-18
791-PK-18
406-PU-18
405-GY-18
616-BU-18
330-YL-18
BU
BK
YL
WH
200-BK-18
200-BK-18
877-YL-18
SPARE
12
1
WORK
MODE SW
121-1124
200-BK-18
200-BK-18
447-PK-18
113-OR-18
D816-WH-18
763-BU-18
129-BU-18
17
200-BK-18
COOLANT TEMP SW
792-OR-18
506-PU-18
108-BU-18
B965-GY-18
142-BU-18
200-BK-18
200-BK-18
323-WH-18
ENG OIL PRESS SW
SERVICE
METER
6T-7337
16
15 SAFETY RELAY
GLOW14
13 GND
+
-
CAB
POWER
MODE SW
121-1123
763-BU-18
D816-WH-18
323-WH-18
200-BK-18
113-OR-18
4
5
1
2
447-PK-18
200-BK-18
200-BK-18
200-BK-18
616-BU-18
142-BU-18
B965-GY-18
168-GN-18
447-PK-18
113-OR-18
+BATT
FUEL TANK UNIT
877-YL-18
330-YL-18
WH
YL
BK
RD
ATCH
TRAVEL
SPEED SW
121-1122
616-BU-18
405-GY-18
406-PU-18
791-PK-18
108-BU-18
506-PU-18
616-BU-18
616-BU-18
616-BU-18
441-OR-18
142-BU-18
616-BU-18
616-BU-18
442-GY-18
200-BK-18
200-BK-18
168-GN-18
142-BU-18
200-BK-18
3
1
L5
L3
5
4
D815-PU-18
L3
D
403-GN-18
L4
792-OR-18
142-BU-18
L4
2
616-BU-18
GND
200-BK-18
D816-WH-18
792-OR-18
763-BU-18
616-BU-18
142-BU-18
WH
YL
BK
RD
3
4
5
1
WASHER SW
121-1120
2
200-BK-18
200-BK-18
WH
YL
BK
WIPER SW
121-1119
RD200-BK-18
200-BK-18
CHASSIS/BOOM
LAMP SW
121-1118
403-GN-18
ACTION ALARM
ACTION ALARM-
ACTION ALARM+
HH
H
H
H
H
H
H
H
GG
H
C
C
H
AZ
C
H
135-BU-18
210-BK-18
1
2
310-PU-18
877-YL-18
121-YL-18
321-BR-18
786-GN-18
306-GN-18
330-YL-18
101-RD-14
101-RD-14
109-OR-14
109-OR-14
120-YL-18
A
BK
BK
BK
L16
BK
RD
210-BK-18
A C
L14
L15
817-WH-18
HH GG
506-PU-18
OPERATOR STATION
799-WH-18
327-PK-14
D746-PK-18
403-GN-18
309-GY-18
817-WH-18
441-OR-18
406-PU-18
405-GY-18
817-WH-18
109-OR-6
101-RD-6
120-YL-18
304-WH-8
877-YL-8
200-BK
2
1
321-BR-18
109-OR-6
109-OR-14
109-OR-14
101-RD-14
101-RD-14
330-YL-18
D814-GY-18
306-GN-18
120-YL-18
786-GN-18
817-WH-18
190-PK-18
321-BR-18
121-YL-18
877-YL-18
310-PU-18
109-OR-8
10
1
2
3
4
5
9
8
7
6
190-PK-18
D814-GY-18
H
A
405-GY-18
406-PU-18
441-OR-18
120-YL-18
786-GN-18
817-WH-18
321-BR-18
101-RD-8
L7
121-YL-18
210-BK-18
135-BU-18
60A
200-BK
ALT BREAKER
9S-0174
START RELAY
085-5200
HEATER RELAY
085-5353
109-OR-14
310-PU-18
309-GY-18
877-YL-18
306-GN-18
330-YL-18
A
200-BK-18
786-GN-18
200-BK-18
330-YL-18
101-RD-14
877-YL-8
101-RD-14
200-BK-18
109-OR-14
109-OR-14
799-WH-18
10
9
109-OR-6
101-RD-6
403-GN-18
877-YL-8
8
CONSOLE
GND
304-WH-8
200-BK-18
200-BK-18
200-BK
7
200-BK-18
210-BK-18
200-BK-18
6
5
4
3
135-BU-18
306-GN-18
210-BK-18
ATCH
TRAVEL ALARM TIMER
9G-7410
D746-PK-18
A
+ BATTERY
ALARM
CANCEL
PRESS.
327-PK-14
2
5
4
3
1
135-BU-18
101-RD-6
109-OR-8
120-YL-18
135-BU-18
BK-18
109-OR-14
121-YL-18
PK-18
H
200-BK-18
L15
CONVERTER
114-7143
+12V
A
GND
CONN 10
CONN 9
CONN 23
CONN 11 CONN 25
+12 MEMORY OUT
GND
+ BAT.
5
4
3
2
1
1
2
3
1
304-WH-8
2
H
506-PU-18
BK-18
RD-18
OR-18
101-RD-8
323-WH-18
323-WH-18
616-BU
322-GY-18
607-PK-18
200-BK-18
323-WH-18
447-PK-18
D816-WH-18
B965-GY-18
200-BK
763-BU-18
442-GY-18
228-BK-18
B
B
B
B
B
B
447-PK-18
200-BK-18
B965-GY-18
200-BK-18
L2
L1
1
2
T
2
1
BK
BK/PK
CHASSIS
442-GY-18
574-WH-18
1
2 200-BK-18
D816-WH-18
574-WH-18
ATCH
BLADE
SOL
7I-2395
ATCH
TRAVEL SPEED
SOL
4I-5674
FUEL
SENSOR
7Y-3848
442-GY-18
200-BK-18
321-BR-18
321-BR-18
B
574-WH-18
HYD OIL
TEMP SENDER
096-4643
TRENCHING
SOL
4I-5674
763-BU-18
200-BK-18
1
2
228-BK-18
BK
YL
BK
607-PK-18
200-BK-18
574-WH-18
321-BR-18
200-BK-18
D816-WH-18
323-WH-18
574-WH-18
L1
200-BK-18
FUEL PUMP
103-0367
CONN 58
2
447-PK-18
200-BK-18
200-BK-18
B965-GY-18
200-BK-18
200-BK-18
L8
2
1
B
ENG/PUMP CONT
SOL
4I-5674
B965-GY-18
D816-WH-18
200-BK-18
MOTOR
321-BR-18
200-BK-18
763-BU-18
447-PK-18
1
200-BK-18
763-BU-18
200-BK
442-GY-18
ATCH
TRAVEL ALARM
3T-1444
RD-0
616-BU
442-GY-18
322-GY-18
228-BK-18
763-BU-18
BK/YL
321-BR-18
D816-WH-18
B965-GY-18
447-PK-18
323-WH-18
B
PE
P
H
H
G
C
200-BK-18
374-PK-18
D814-GY-18
405-GY-18
406-PU-18
441-OR-18
309-GY-18
403-GN-18
D746-PK-18
103-YL-18
327-PK-14
506-PU-18
330-YL-18
200-BK-18
321-BR-18
877-YL-18
310-PU-18
107-WH-14
118-GY
500-BR
792-OR-18
791-PK-18
501-GN
124-GN-18
607-PK-18
616-BU
112-PU-14
112-PU
105-BR-14
108-BU-18
200-BK-18
142-BU-18
113-OR-18
322-GY-18
320-OR-18
168-GN-18
129-BU-18
190-PK
OPERATOR STATION
CC
G
G
799-WH-18
200-BK-18
200-BK-18
786-GN-18
ATCH
LIGHT SW
(CAB LAMP)
7X-6386
2 RD
1 BK
E
200-BK-18
2
1
BK1
RD2
799-WH-18
ATCH
TRAVEL ALARM
CANCEL SW
7X-6387
615-YL
P
P
200-BK
ATCH
CAB LAMP
105-9949
500-BR
RD/BU-18 RD-18
BK-18
WH-18BK-18
WH-18
RD-18
E
L5
RD/BU-18
L7
118-GY
P
E P
501-GN
ATCH
CAB LAMP
105-9949
L7
PLATFORM
200-BK
320-OR
4
200-BK-18
200-BK-18
615-YL
200-BK-18
200-BK-18
615-YL
4
200-BK-18
200-BK-18
135-BU-18
786-GN-18
615-YL-18
210-BK-18
200-BK-18
374-PK-18
200-BK
320-OR
320-OR-18
200-BK-18
Y
Y
P
P
200-BK-18
E
200-BK-18
C
EE
EE
WH/BK-20
BU/BK-20
BU-20
BU/WH-20
615-YL-18
574-WH-18
307-OR-18
200-BK-18
200-BK-18
CHASSIS
+
S
+1
-
MOTOR
NEUTRAL
START SW
9W-2150
WIPER
113-2917
HORN SW
6I-5088
501-GN
118-GY
500-BR
200-BK
FF
DISCONNECT
SW
7N-0718
CCBBAA
B
L
N (NOTE B)B
ATCH
BOOM LAMP
105-9949
BK-0
BK-0BK-0RD-0
322-GY-18
RD-18
M
L1
L2
M
BATTERY
3T-5760
WH-18
616-BU
200-BK
200-BK
616-BU
WH-18200-BK
CHASSIS LAMP
105-9949
L
N (NOTE B)
M
B
RD-18616-BU
2
1
NEG
POS
CHASSIS
NEG
POS
200-BK-18
607-PK-18
ATCH
BOOM LAMP
105-9949
HORN
096-1491
WH-18
RD-18
786-GN-18
CC
J
C
180-GN
AUX
615-YL
190-PK
129-BU-18
168-GN-18
320-OR-18
322-GY-18
113-OR-18
142-BU-18
200-BK-18
108-BU-18
105-BR-14
112-PU
112-PU-14
616-BU
607-PK-18
124-GN-18
501-GN
791-PK-18
792-OR-18
500-BR
118-GY
107-WH-14
10
1
2
3
4
127-OR
103-YL-18
607-PK-18
107-WH-14
616-BU
115-PK
791-PK-18
5
118-GY
500-BR
792-OR-18
791-PK-18
501-GN
124-GN-18
607-PK-18
616-BU
500-BR
501-GN
112-PU
112-PU-14
105-BR-14
108-BU-18
320-OR-18
200-BK-18
322-GY-18
114-GN-18
114-GN-18
310-PU-18
877-YL-18
321-BR-18
330-YL-18
101-RD-14
142-BU-18
113-OR-18
322-GY-18
320-OR-18
109-OR-14
101-RD-14
101-RD-14
506-PU-18
108-BU-18
103-YL-18
327-PK-14
103-YL-18
D746-PK-18
403-GN-18
309-GY-18
441-OR-18
406-PU-18
405-GY-18
168-GN-18
129-BU-18
190-PK
D814-GY-18
118-GY
118-GY
112-PU-14
9
112-PU-14
190-PK-18
190-PK-18
D814-GY-18
200-BK-18
127-OR 124-GN-18
ATCH
CAB
LAMP RELAY
7Y-5490
8
405-GY-18
406-PU-18
441-OR-18
309-GY-18
403-GN-18
D746-PK-18
327-PK-14
506-PU-18
120-YL-18
109-OR-14
109-OR-14
101-RD-14
574-WH-18
120-YL-18
109-OR-14
109-OR-14
101-RD-14
101-RD-14
330-YL-18
7
786-GN-18
321-BR-18
121-YL-18
877-YL-18
310-PU-18
101-RD-14
J
7
6
142-BU-18
168-GN-18
113-OR-18
129-BU-18
5
4
3
2
129-BU-181
L7
RD
115-PK
127-OR
168-GN-18
ENG SHUTDOWN SOL
112-PU-18
OPERATOR STATION
111-YL
L14
112-PU-18
135-BU-18
210-BK-18
615-YL
BLADE LOCK
RELAY
7Y-5490
NEUTRAL
START
RELAY
7Y-5490
112-PU-18
320-OR-18
322-GY-18
120-YL-18
113-OR-18
RD
142-BU-18
10A
10A
135-BU-18
210-BK-18
190-PK
10A
15A
110-GN
200-BK-18
108-BU-18
CHASSIS/BOOM LAMP
WIPER
306-GN-18
118-GY
112-PU-18
307-OR-18
574-WH-18
112-PU
GOV ACTR
CAB LAMP
374-PK-18
105-BR-14
10A
15A
115-PK
109-OR-14
109-OR-14
10A
A/C HEATER
WASHER
112-PU
15A
112-PU-14
114-GN-18
616-BU
20A
15A
190-PK
103-YL-18
TRAVEL ALARM
101-RD-14
110-GN
200-BK-18
607-PK-18
112-PU-18
GOV RELAY
7Y-5490
124-GN-18
501-GN
791-PK-18
L6
RADIO
120-YL-18
J
792-OR-18
306-GN-18
500-BR
307-OR-18
374-PK-18
574-WH-18
306-GN-18
118-GY
109-OR-14
109-OR-14
HORN
121-YL-18
112-PU-18
DOME LAMP
121-YL-18
786-GN-18
101-RD-14
101-RD-14
10A
10A
7
6
112-PU
5
4
3
2
307-OR-18
L7
10A
10A
574-WH-18
374-PK-18
306-GN-18
1
374-PK-18
574-WH-18
307-OR-18
306-GN-18
307-OR-18
J
C
374-PK-18
107-WH-14
6
111-YL
112-PU-18
111-YL
615-YL
121-YL-18
786-GN-18
108-BU-18
109-OR-14
615-YL
107-WH-14
CHASSIS/BOOM
LAMP RELAY
7Y-5490
10A
10A
10A
10A
200-BK-18
129-BU-18
107-WH-14
792-OR-18
CIGAR LIGHTER
WIPER RELAY
7Y-5490
112-PU-18
374-PK-18
615-YL
121-YL-18
1
105-BR-14
HORN RELAY
7Y-5490
A/C RELAY
7Y-5490
112-PU
10A
Z
103-YL-18
113-OR-18
MONITOR
KEY SW
2
3
4
5
6
7
8
9
10A
10
111-YL
105-BR-14
124-GN-18
791-PK-18
786-GN-18
607-PK-18
616-BU
322-GY-18
320-OR-18
200-BK-18
124-GN
CONN 33
190-PK
792-OR-18
118-GY
SOLENOID
20A
501-GN
500-BR
120-YL-18
168-GN-18
FUEL AIR BLEED
142-BU-18
FUSE
10A 9W-1442
15A 9W-1441
20A 9W-1446
WIRE AS.
GG 125-4752 J-8
HH 125-4753 J-8
Z 125-1780 F-7
NOTE C : USE WITH COLD WEATHER.
D39003
NOTE B : USE WITH OFFSET BOOM.
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAGE.
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
THIS SCHEMATIC IS FOR THE 307 EXCAVATOR. (125-4703)
DD 116-0147 A-9
CC 111-4740 A-3
BB 102-7949 A-3
AA 102-7948 A-3
CABLE AS.
M 111-4755 C-3
L 111-4754 C-3
K 125-4730 E-4
J 125-4803 G-5
H 125-4799 H-7
G 7Y-3868 H-2
F 125-4818 D-8
E 125-4817 D-8
D 125-4728 D-8
C 125-4725 D-4
A 125-4724 G-8
DESCRIPTIONSYMBOL
CONNECTOR
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
BLADE, SPADE, RING,
OR SCREW TERMINAL
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ATCH WIRE, CABLE,
COMPONENT
L#
CIRCUIT GROUPING
DESIGNATION
IDENT PART NO. LOC
HARNESS AS.
P 106-0024 H-1
B 125-4723 D-4
N 105-9946 C-3
EE 1S-2342 J-2
FF 111-4741 A-3
NOTE A : NORMALLY OPEN BEFORE REFRIGERANT CHARGE.
Y 5I-8217 G-2
ELECTRICAL CONNECTION
TO MACHINE STRUCTURE
9
8
7 3
2
16 5 4
9
8
7 3
2
16 5 4
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
BK
PK
YL
OR
WH
RD
GN
BU
GREEN
BLUE
Z
C
B
A
D
E
F
G
H
J
C
B
A
D
E
F
G
H
J
CONN 8
CONN 22
CONN 5
CONN 4
CONN 3
CONN 6 CONN 2
CONN 31
CONN 65
CONN 24
CONN 30
CONN 64
CONN 63
CONN 62
CONN 61
CONN 60
CONN 59
CONN 12
CONN 13
CONN 15
CONN 16
CONN 17
CONN 32
CONN 26 CONN 27 CONN 28 CONN 29
CONN 18
CONN 19
CONN 20
CONN 1
CONN 7
CONN 57
CONN 56
CONN 21
CONN 35
CONN 37
CONN 39
CONN 36
CONN 40
CONN 41 CONN 42
CONN 43
CONN 38
CONN 44
CONN 45
CONN 46
CONN 47
CONN 49
CONN 51
CONN 52
CONN 50
CONN 48
CONN 53
CONN 54
CONN 55
ALL DASHED LINES ARE ATTACHMENTS.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS OFF.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS ON.
STARTING CIRCUIT.
MONITORING CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
ENGINE SHUTDOWN CIRCUIT.
START AID CIRCUIT.
CONTROLLER CIRCUIT.