Bobcat 331 Mini Excavator Electrical Repair & Troubleshooting Schematic (S/N 234313000 – 234313120) 331E (S/N 234412000 – 234412010) 334 (S/N 234513000 – 234513112)

BATTERY FEED 1000-1999 RED, RED/WHT, RNG
GROUND 2000-2999 BLK
MONITORING 3000-3999 LBL
HYDRAULIC 4000-4999 LGN
ATTACHMENT CONTROLS 5000-5999 YEL
LIGHTS 6000-6999 PNK
ACCESSORIES 7000-7999 WHT
ENGINE 8000-8999 TAN
COMMUNICATION 9000-9999 PUR
WIRES CONNECT BY LETTER
ACROSS CONNECTORS
A
B
B
A
A
6220
SOME CONNECTOR
BODIES NOT SHOWN
FOR DRAWING CLARITY
RED =
RED
RNG =
ORANGE
BLK =
BLACK
LBL =
LIGHT BLUE
DBL =
DARK BLUE
LGN =
LIGHT GREEN
DGN =
DARK GREEN
YEL =
YELLOW
PNK =
PINK
WHT =
BRN =
BROWN
TAN = TAN
PUR =
PURPLE
GRY =
GRAY
WASHER
BOTTLE
BEACON
CAB AND WIPER WIRING
(IF SO EQUIPPED)
HARNESS 7100772
AND 7100774
6
3
1
0
C467
LOAD MOMENT
(OPTIONAL)
BEACON
SWITCH
(OPTIONAL)
7100
7120
1460
7110
WIPER SWITCH
(OPTIONAL)
1
3
2
4
6
5
1720
3700
1
3
2
4
6 5
63006310
C
A
D
E
B
1720
4830
4400
4390
9200
CONSOLE
SENSOR
A
B
C
A
B
C
D
E
F
G
H
J
K
1730
3310
4370
4380
3900
3700
3910
3920
3900
H
F
J
D
C
G
B
A
E
K
2900
2950
6300
1460
7110
2930
2930
2900
62302950
FRAME
LIGHT
RED
E
A
D
LEFT HANDLE
BRN
B
C
DETENT
1730
1
3
2
4
6
5
3100
4830
9200
6230
6240
2790
6400
C A B
6
3
1
0
7120
6
2
4
0
7100
2960
FUEL SENDER 20-270 ohm
B
A A
B
3100
3310
C158
LH CONSOLE
HARNESS
6817244
B A
6400
2790
B A
1
2
HYD FILTER
SWITCH
C462
C461
C458 C457
C465
A
C
D
B
F
E
H
G
J
K
A
E
F
K
D
C
J
B
G
H
LOAD MOMENT
(
OPTIONAL
4830
4380
4370
3900
1730
2930
6300
6230
1460
6240
7110
2790
+
-
7110
2
8
2
0
3700
6
4
0
0
2840
AUX
SOCKET
A
6220
A
B
2650
7130
TRAVEL
ALARM
(OPTIONAL)
7
2
1
0
3100
3310
9200
HYD TEMP
SENDER
538-1824 ±30
ohm
3430
t
3300
3320
3700
6400
B A
6400
2950
GRN
BRN
YEL
7100772
B A
6240
6310
C A B
C A B
6
0
4
0
A
A
WIRING SCHEMATIC
331 (S/N 234313000 - 234313120)
331E (S/N 234412000 - 234412010)
334 (S/N 234513000 - 234513112)
(PRINTED NOVEMBER 2006)
V-0639
1 of 6
Dealer Copy -- Not for Resale
RED = RED
RNG = ORANGE
BLK = BLACK
LBL = LIGHT BLUE
DBL = DARK BLUE
LGN = LIGHT GREEN
DGN = DARK GREEN
YEL = YELLOW
PNK = PINK
WHT = WHITE
BRN = BROWN
TAN = TAN
PUR = PURPLE
GRY = GRAY
J4
LOAD MOMENT
(OPTIONAL)
37103700
DH CF K G EA JB
9330
9350
9360
8550
3500
3600
8120
3430
KEY
CRANK
FUEL PULL STATUS
ENGINE SPEED VR
ENG OIL PRESS
GLOW PLUG STATUS
STARTER STATUS
HYD OIL FILTER
ENGINE SPEED HALL
TRAVEL PEDAL SWITCH
CONSOLE
FUEL SENDER
ENGINE TEMP
HYD TEMP
SENSOR POWER (+8V)
SENSOR GROUND
J3
3200
3100
3300
3900
4310
4300
4830
SPARE ANG #1
A EG FDK BJ C H
BATTERY
GLOW PLUG
LIGHT
FUEL PULL
FUEL HOLD
SWITCHED POWER RELAY
STARTER
GROUND
GROUND
BATTERY
J1
8510
6210
8110
8150
8000
2
1
1
0
2
1
0
0
1120
1110
9370
F EBAKHJ
CAN HIGH
CAN LOW
CAN SHIELD
R POT SIGNAL
2
S
P
E
E
D
L SKI UP
L SKI DOWN
J5
4960
4320
G HCD A BF E
L POT SIGNAL
3430
3300
3320
9
2
0
0
HORN
9500
9600
9700
3720
2 of 6
Dealer Copy -- Not for Resale
2330
4340
2340
4450
2450
DIVERTER FOR 2ND AUX
(OPTIONAL)
FRONT ROD
FRONT BASE
4970
2480
TWO-SPEED
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
4340
F
K
J
G E
C
H
D
A
B
4330
4500
4970
4450
9320
3710
4330
9320
2610
-
+
BUZZER
C413
C414
C419
C420
YELLOW TIE STRAP
BLUE TIE STRAP
6 ohm nominal
at 12 VDC
6 ohm nominal
at 12 VDC
8 ohm nominal
at 12 VDC
8 ohm nominal at 12 VDC (325/328)
6 ohm mominal at 12VDC (331/331E/334)
RED TIE STRAP
J2
P
I
E
Z
O
O
U
T
L
O
A
D
M
O
M
E
N
T
S
P
A
R
E
R
E
L
A
Y
O
U
T
W
O
R
K
G
R
O
U
P
D
2
5
A
N
D
D
3
1
P
W
M
W
O
R
K
G
R
O
U
P
D
3
7
2
S
P
E
E
D
P
W
M
D
I
V
E
R
T
E
R
O
U
T
F
R
O
N
T
B
A
S
E
F
R
O
N
T
R
O
D
S
P
A
R
E
K
E
Y
L
E
S
S
S
O
L
RIGHT HAND CONSOLE
HARNESS 6809046
C455
C456
CONTROL MODULE
CONNECTORS J1-J6
B
ST
I
RED
WHT
A
B
C
D
E
4320
4920
1770
4350
4360
TWO-SPEED
(BLADE LEVER)
17804960
A
B
F CG DEBA
C
A
N
H
I
G
H
C
A
N
L
O
W
R
P
O
T
S
I
G
N
A
L
R
S
K
I
U
P
R
S
K
I
D
O
W
N
D
E
T
E
N
T
2
S
P
E
E
D
J5
4
9
6
0
4
9
2
0
4
3
2
0
ABCDEF
S
P
A
R
E
D
I
G
#
2
S
P
A
R
E
D
I
G
#
1
U
N
U
S
E
D
#
2
U
N
U
S
E
D
#
3
S
P
A
R
E
A
N
G
#
2
J6
U
N
U
S
E
D
#
1
RIGHT HANDLE
BLK
GRN
WHT
PWM
E
A
D
BRN
RED
B
C
DETENT
2
1
2
0
2
1
2
0
9340
9330
C
A
B
C
A
B
9
5
0
0
9
6
0
0
4520
2520
WORK GROUP
LOCKOUT
A
B
A
B
C414
GREEN TIE STRAP
8 ohm nominal
at 12 VDC
4510
2510
WORK GROUP
LOCKOUT
A
B
A
B
C414
ORANGE TIE STRAP
8 ohm nominal
at 12 VDC
14903720
B A
TRAVEL PEDAL SWITCH
3 of 6
Dealer Copy -- Not for Resale
A
B
A B
2940
6220
BOOM LIGHT
HARNESS
6808415
A B
6
2
2
0
2
9
4
0
BOOM
LIGHT
WASHER
BOTTLE
14801080
S
EXC
BAT
G
1080
9390
9360
STARTER
S
M
ALTERNATOR
B
SPEED
SENSOR (VR)
3600
3630
A
B
A
B
ENGINE COOLANT
SENDER
500-3000 ± 30 ohm
3200
3210
t
ENGINE OIL
PRESSURE
SWITCH
3500
3600
3630
A
B
A
B
3210
3200
ENGINE HARNESS
6817272 331/331E/334
HR
GLOW PLUGS
0.4 ohm
K
C
H
G
D
E
F
J
A
B
9390
9360
1480
3210
3200
3500
3630
3600
8550
A
B
C
8500
8100
8150
8500
8550
GROUNDS
2060
2800
1090
DOME
LIGHT
2880 6400
BEACON
6
3
1
0
2
8
7
0
25A
1
7
4
0
2
7
4
0
1
1
9
0
1030
1040
B AC
+
-
BATTERY
1
3
1
0
FUSE 6
HEATER
C161
C460
A
B
6220
2
9
4
0
K
C
H
G
D
E
F
J
A
B
9390
9360
1480
3210
3200
3500
3630
3600
8550
A
B
C
8500
8100
8150
M
WIPER MOTOR
7
C A B
C A B
2
8
6
0
6
2
4
0
B A
CAB LIGHT
CONN
GROUND SPLICE
2880
2870
2950
2860
A
B
A
B
A
B
C
2800
8100
8150
8100
8150FUEL SHUT OFF
WHT TO BLK = 0.26 OHM
RED TO BLK = 10.9 OHM
HOLD
PULL
A
B
C
2800
8100
81508150
8100
A
B
A
B
FUEL SHUTOFF SOLENOID (EARLY MODELS)
C101
C101
A
B
C
HOLD
PULL
FUEL SHUT OFF
HOLD = 0.33 OHM
PULL = 24.5 OHM
FUEL SHUTOFF SOLENOID (LATER MODELS)
C450
C451
C160
C159
4 of 6
Dealer Copy -- Not for Resale
SWITCHED
POWER
8
0
0
0
8530
868787A
7200
25A
1480
20A
1
3
3
0
1050
2
0
0
0
2
0
1
0
STARTER
9
3
8
0
9
3
9
0
8530
868787A
1
0
7
0
1740
SWITCH POWER
FUEL
SHUTOFF
8
1
1
0
8
1
2
0
8530
868787A
1
3
5
0
2
0
1
0
2
0
3
0
25A
8
1
0
0
5A
WIPER POWER
1460
7200
2830
RADIO
CONN
25A
ACD POWER
1320
LIGHT
RELAY
6
2
1
0
6
2
0
0
20A
85 30
86 87 87A
1
3
7
0
2
0
3
0
2
0
4
0
1
3
1
0
2
0
5
0
1
3
6
0
6
3
0
0
25A
1
1
5
0
1
1
1
0
1
1
2
0
7
2
2
0
7
2
1
0
RADIO
MEMORY
15A
1
3
6
0
ALT / HEATER
FUSE 8
FUSE 4
FUSE 1
FUSE 3
FUSE 2
FUSE 11
FUSE 9 FUSE 12
1470
+
-
RELAY GROUNDS 2000-2050
ARE CONNECTED IN SERIES
7
2
2
0
1
5 of 6
Dealer Copy -- Not for Resale
25A
1
1
4
0
1
1
5
0
1
3
2
0
2
7
1
0
1
1
4
0
D E FG
8
5
1
0
8
5
5
0
1
0
6
0
2
0
4
0
2
0
5
0
GLOW
PLUG
8530
868787A
9
7
0
0
9
6
0
0
9
5
0
0
BA
2
0
9
0
2
0
9
0
DC
A B E FG
120 ohm
ACD & REMOTE START
CONNECTOR
9
4
0
0
5A
1
3
1
0
7
2
2
0
7
2
1
0
RADIO
MEMORY
15A
1
3
6
0
ALT HEATER
25A
HEATERSW POWER
ACD
CONTROLLER
ACD
AUX
LIGHTS
LIGHTS
SWITCH
POWER
GLOW
PLUGS
STARTER
20A
25A
25A
25A
15A
20A
25A
WIPER
5A
FUSE 7
FUSE 8
FUSE 9
FUSE 10
FUSE 11
FUSE 12
FUSE 1
FUSE 2
FUSE 3
FUSE 4
FUSE 5
FUSE 6
FUEL
PULL
IGN
5A
25A
FUEL
FUSE 7
FUSE
12
FUSE 10
7
2
2
0
1
C
C453
C455
IGNITION
SWITCH
B
ST
I
RUN
START
OFF
RED
WHT
DGN
9340
9330
9400
C
A
D
B
C
A
D
B
2300
2100, 2110, 2610, 2740,
2790, 2840, 2930
2310
2000, 2330, 2340, 2450, 2480, 2510,
2520,2650, 2710, 2820, 2830, 2940
GROUNDS
POWER LEADS
1040 1070
1150
1330
1
0
3
0
1060
1310
1360
V
-
0
6
3
9
(
1
1
-
1
-
0
6
)
6 of 6
Dealer Copy -- Not for Resale
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