307 EXCAVATOR ELECTRICAL SYSTEM SCHEMATIC

SENR6219
JULY 1994
307 Excavator
Electrical System
2WM1-UP
©
1994 Caterpillar
All Rights Reserved
Printed in U.S.A.
101-RD-8
109-OR-8
RD/WH
RD
BU/WH
BU
BU/BK
RD/WH
CONSOLE BOX
RD
322-GY
200-BK
616-BU
BK-18
RD/BU-18
BK-18
RD/BU-18
200-BK
616-BU
200-BK
1
BK
BK/PK
200-BK
WH-18
114-GN
RD-18
WH-18
200-BK
615-YL
200-BK
501-GN
500-BR
1
2
2
1
500-BR
118-GY
501-GN
CONSOLE BOX
WH/GN
307-OR
310-PU
2
310-PU
309-GY
101-RD-10
330-YL
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
6
441-OR
1
405-GY
406-PU
616-BU
322-GY
607-PK
447-PK
306-GN
877-YL
112-PU-10
309-GY
403-GN
D746-PK
200-BK
101-RD-8
109-OR-8
D746-PK
309-GY
403-GN
403-GN
330-YL
506-PU
101-RD-10
310-PU
616-BU
113-OR
129-BU
5
200-BK
200-BK
118-GY
200-BK
200-BK
403-GN
B965-GY
200-BK
200-BK
190-PK
201-BK
410-WH
109-OR-6
109-OR-8
447-PK
442-GY
BK-18
607-PK
441-OR
330-YL
190-PK
405-GY
403-GN
304-WH-8
201-BK
200-BK-10
406-PU
200-BK
201-BK
112-PU-10
WH
607-PK
109-OR-8
403-GN
330-YL
113-OR
201-BK
BK-18
142-BU
442-GY
101-RD-10
306-GN
307-OR
200-BK
320-OR
1
124-GN
112-PU-10
B965-GY
200-BK
RD-18
506-PU
201-BK
405-GY
406-PU
441-OR
309-GY
403-GN
109-OR-6
D746-PK
CONSOLE BOX
RD-18
WH-18
200-BK
309-GY
RD-0
306-GN
GY
200-BK
200-BK
447-PK
B965-GY
442-GY
200-BK
2
3
200-BK
D746-PK
877-YL-8
817-WH
121-YL
817-WH
321-BR
103-YL
500-BR
118-GY
501-GN
BK
799-WH
200-BK
BU/WH
WH
2
1
210-BK
135-BU
BU
200-BK
BU/BK
322-GY
BK-0
200-BK
120-YL
321-BR
114-GN
200-BK
320-OR
OR
200-BK
200-BK
101-RD-10
118-GY
200-BK
500-BR
615-YL
200-BK
322-GY
500-BR
200-BK
615-YL
RD-18
309-GY
WH
327-PK-14
WH/GN
YL
BK
118-GY
500-BR
114-GN
118-GY
501-GN
115-PK
103-YL
200-BK
615-YL
200-BK
817-WH
200-BK
101-RD-6
607-PK
200-BK
200-BK
200-BK
200-BK
200-BK
200-BK
200-BK
D746-PK
501-GN
109-OR-8
101-RD-8
PK
306-GN
200-BK
112-PU-10
307-OR
320-OR
321-BR
307-OR
320-OR
306-GN
501-GN
129-BU
200-BK
113-OR
5
327-PK-14
4
RD/GN
WH/BU
YL
WH/GN
BK
WH/YL
RD/WH
142-BU
118-GY
501-GN
442-GY
500-BR
118-GY
120-YL
200-BK
877-YL
817-WH
B965-GY
447-PK
200-BK
330-YL
403-GN
607-PK
3
200-BK
200-BK
101-RD-8
101-RD-6
109-OR-8
200-BK
615-YL
200-BK
114-GN
200-BK
103-YL
129-BU
607-PK
310-PU
RD-0
118-GY
321-BR
115-PK
RD-0
877-YL
200-BK
501-GN
877-YL-8
101-RD-6
109-OR-6
616-BU
200-BK-10
607-PK
200-BK
327-PK-14
D814-GY
2
441-OR
406-PU
405-GY
201-BK
442-GY
D816-WH
B965-GY
200-BK
101-RD-8
101-RD-6
109-OR-6
201-BK
304-WH-8
CONSOLE BOX
817-WH
114-GN
321-BR
112-PU-10
118-GY
103-YL
D815-PU
B786-BU
309-GY
320-OR
200-BK
322-GY
113-OR
200-BK
142-BU
322-GY
121-YL
114-GN
127-OR
142-BU
129-BU
124-GN-14
113-OR
190-PK
115-PK
103-YL
118-GY
120-YL
113-OR
330-YL
403-GN
607-PK
406-PU
201-BK
405-GY
441-OR
877-YL
442-GY
447-PK
D813-OR
B786-BU
D815-PU
D816-WH
142-BU
B965-GY
142-BU
200-BK
200-BK
4
1
321-BR
200-BK
309-GY
403-GN
CONSOLE BOX
447-PK
200-BK
D814-GY
200-BK
200-BK
200-BK
200-BK
B786-BU
D814-GY
190-PK
D816-WH
442-GY
190-PK
201-BK
799-WH
506-PU
200-BK
616-BU
200-BK
RD-18
WH-18
WH-18228-BK
877-YL
D816-WH
142-BU
607-PK
307-OR
200-BK-6
799-WH
200-BK
115-PK
118-GY
200-BK-10
817-WH
321-BR
200-BK
118-GY
403-GN
500-BR
307-OR
200-BK-10
190-PK
200-BK-6
BK
200-BK-10
RD
2
1
200-BK
200-BK-10
309-GY
306-GN
CONSOLE BOX
101-RD-14
112-PU-10
101-RD-14
112-PU-10
607-PK
200-BK
200-BK
101-RD-8
200-BK
200-BK
200-BK
228-BK
877-YL-8
310-PU
615-YL
615-YL
D815-PU
112-PU-14
615-YL
118-GY
RD/YL
RD/GN
RD/WH
320-OR
304-WH-8
D816-WH
190-PK
D816-WHD816-WH
D816-WH
101-RD-10
200-BK
B965-GY
B965-GY
190-PK
327-PK-14
877-YL
109-OR-8
D814-GY
101-RD-6
405-GY
201-BK
406-PU
304-WH-8
6
877-YL-8
109-OR-6
5
4
2
1
101-RD-6
506-PU
127-OR
D746-PK
109-OR-6
403-GN
441-OR
3
228-BK
D813-OR
D814-GY
D815-PU
101-RD-8
4
3
200-BK
200-BK
304-WH-8
1
447-PK
D816-WH
B965-GY
2
7
D814-GY
190-PK
B965-GY
BK-0
327-PK-14
442-GY
101-RD-6
877-YL-8
442-GY
616-BU
322-GY
616-BU
799-WH
200-BK
200-BK
101-RD-6
BK-0
304-WH-8
447-PK
506-PU
D746-PK
403-GN
309-GY
447-PK
200-BK
607-PK
322-GY
616-BU
406-PU
405-GY
441-OR
200-BK-6
190-PK
190-PK
115-PK
330-YL
118-GY
306-GN
BK
103-YL
YL
142-BU
607-PK
817-WH
B786-BU
RD-0
129-BU
200-BK
113-OR
447-PK
RD/YL
B965-GY
615-YL
D816-WH
321-BR321-BR
2
200-BK
1
321-BR
127-OR
2
321-BR
322-GY
112-PU-14
190-PK
309-GY
D813-OR
127-OR
200-BK
200-BK
200-BK
442-GY
BK-0
109-OR-6
304-WH-8
877-YL-8
120-YL
200-BK
F
E
D
9 8 7
C
B
A
9
8 7
112-PU-14
6 5 4
112-PU-14
6 5 4
3 2
1
F
E
D
3 2
1
C
B
A
J
T
J
L2
L3
L7
NOTE B : USE WITH OFFSET BOOM.
E
B
M
L
B
M
A A
A
A
CC
G
G
B
CC
A
BBAA
B
K (NOTE B)
DB
FF
H
H
H
H
F
C
C
CC
B
C
A
C
B
B
B
B
B
A
A
A
A
AA
EE
CH
G C
A A
A
A
A
L9
L12
L9
L7
L6
L5
L4L12 L12
L10
L11
L10
L11
L7
L9
L6
L5
L4
L3L3
L3
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 (113-6903).
A
DD 111-4741 A-3
CC 111-4740 A-3
BB 102-7949 A-3
AA 117-0416 A-3
CABLE AS.
K (NOTE B)
D
E
A
J 6C-8839 F-1
H 105-9967 E-6
G 102-7953 D-9
F 102-7952 F-1
E 111-4755 B-2
D 111-4754 B-2
C 116-7778 C-4
A 116-7795 C-4
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
DESCRIPTIONSYMBOL
CONNECTOR
ELECTRICAL CONNECTION
TO VEHICLE STRUCTURE
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
BLADE, SPADE, RING,
OR SCREW TERMINAL
BK
PK
YL
OR
WH
RD
GN
BU
GREEN
BLUE
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ATCH WIRE, CABLE,
COMPONENT
L#
CIRCUIT GROUPING
DESIGNATION
IDENT PART NO. LOC
HARNESS AS.
A
M
L
L 111-4753 D-6
A
A
C
J
J
11
12
C
13
14
L8
C
C
C
CONT
MOTBAT
A
S
CHASSIS
ENG
MOTOR
L
E
B
P
R
ALT
ALTERNATOR
109-2362
COOLANT TEMP SENDER
117-6399
STARTER
109-2361
60A
GLOW IND
085-5321
ILLUM
SERV METER4
HYD OIL TEMP SENDER
CONSOLE
CONTROLLER
102-8019
KNOB
7Y-9390
ENG GOV ACTR
102-8007
KEY START SW
7Y-3918
OFF
PREHEAT
BR
R1
B
C
R2
ACC
START
ON
ALT BREAKER
9S-0174
START RELAY
085-5200
HEATER RELAY
085-5353
ONE TOUCH LOW IDLE
+ BATTERY
SAFETY RELAY
GND
GND
COOLANT TEMP SW.+
FUEL TANK UNIT
COOLANT TEMP SENDER
ENG OIL PRESS SW.+
ENG OIL PRESS SW.
COOLANT TEMP SW.
ACTION ALARM +
ACTION ALARM -
10
21
ACTION ALARM
3E-6328
MONITOR
105-9970
17
18
19
20
5
6
7
3
16
8
ATCH
BOOM LAMP
105-9949
A
ENG OIL SW
3T-4418
L
NEG
POS
DISCONNECT SW
7N-0718
GND
L8
ATCH
TRAVEL ALARM
CANCEL SW
111-4715
ATCH
A/C UNIT
118-1189
BK-18
L14
ATCH
ANTENNA
7Y-5435
L14
L16
OR-18
RESISTOR
5L-2854
817-WH
190-PK
D814-GY
201-BK
405-GY
406-PU
441-OR
ATCH
LIGHT SW
(CAB LAMP)
094-1422
L
CABLE
093-2060
CIGAR LIGHTER
9W-0335
LIGHT SW
(BOOM/
CHASSIS LAMP)
094-1422
WASHER SW
094-1424
WIPER SW
094-1423
CHASSIS
309-GY
ATCH
TRAVEL ALARM TIMER
9G-7410
9
2
C
1
C
C
D746-PK
B 116-7794 C-4
330-YL
ATCH
A/C CLUTCH SOL
101-1759
CHASSIS LAMP
105-9949
ATCH
CAB LAMP
3A-8951
200-BK
C
CC
403-GN
109-OR-6
D746-PK
200-BK-10
877-YL-8
327-PK-14
309-GY
309-GY
FUEL
SENSOR
7Y-3848
C
HYD OIL
TEMP SENDER
096-4643
A
C
TRENCHING
SOL
7I-2787
ATCH
TRAVEL
PRESS. SW
102-8041
ATCH
CAB LAMP
3A-8951
C
15
C
L2
+ BATTERY
ALARM
L2
L2L8
403-GN
CANCEL
PRESS.
C
2
5
4
3
1
C
C
1
2
PLATFORM
T
10A
15A
15A
C
15A
10A
FUSE
15A 9W-1441
10A 9W-1442
CAB LAMP
SOLENOID
TRAVEL ALARM
CIGAR LIGHTER
MONITOR
DOME LAMP
ATCH
CONVERTER
7T-8000
HORN
ENG GOV CONT
LAMP(CHASSIS/BOOM)
WASHER/WIPER
RADIO
HEATER
A/C
15A
10A
MOTOR
PRESS. SW
102-8041
L13L13
10A
10A
E
L8
A
A
WASHER
096-0486
A
A
519-PK
310-PU
310-PU
SWITCH AS
7X-6387
G
2
1
L1
200-BK
L9
CHASSIS
2
1
C
C
DOME LAMP
096-0721
200-BK
200-BK
ENG/PUMP CONT
SOL
4I-5674
330-YL
403-GN
519-PK
HORN RELAY
094-4522
304-WH-8
101-RD-6
310-PU
310-PU
F
KNOB
105-9976
POWER MODE
CONT SW
5I-9858
513-OR
A
A
POS
NEG
200-BK
200-BK
200-BK
BATTERY
3T-5760
J
2
1
A
KNOB
105-9976
WORK MODE
CONT SW
5I-9858
327-PK
COOLANT TEMP SW
085-5121
CHASSIS
C
ATCH
TRAVEL ALARM
3T-1444
2
1
SAFETY RELAY
094-2080
P
L
R
S
GROUND
519-PK
200-BK
200-BK
J
J
J
K 105-9946 B-2
AIR HEATER
035-8059
ONE TOUCH
LOW IDLE SW
105-9390
200-BK
10A
10A
HEATER
118-1188
ENG GOV CONT
ATCH
BOOM LAMP
105-9949
327-PK
HORN
096-1491
TO RADIO
L
2
1
FF 1S-2342 F-1
DD
RESISTOR
7W-1251
GROUND
A
CHASSIS
A
+12 VOLT
GROUND
+ BATTERY
1
A
2
3
+
S
+1
-
MOTOR
1
2
BK-18
RD-18
NEUTRAL
START SW
9W-2150
WIPER
HORN SW
4I-9968
L
501-GN
ATCH
REFRIGERANT SW
114-5334 (NOTE A)
A
124-GN
A
118-GY
500-BR
200-BK
EE 102-7951 A-9
NOTE A : NORMALLY OPEN BEFORE REFRIGERANT CHARGE.
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.
AIR HEATER START AID CIRCUIT.
CONTROLLER CIRCUIT.
CONN 47
CONN 49
CONN 50
CONN 51
CONN 52
CONN 46
CONN 2
CONN 3
CONN 1
CONN
38
CONN 41
CONN 40
CONN 42
CONN 43
CONN 39
CONN 34
CONN 33
CONN 32
CONN
36
CONN 31
CONN 29
CONN 28
CONN
19
CONN
22
CONN
20
CONN
23
CONN
24
CONN 26
200-BK
CONN 11
CONN 10
CONN 61 CONN 60
CONN 18
CONN 6
CONN 5
T
ENG
SHUTDOWN
SOL
CONN 56
CONN 54
CONN 55
CONN 57
CONN 30
CONN 45
CONN 44