©
2001 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR4964
April 2001
3500 Engines For Caterpillar Built
Generator Sets Electrical System
CMD1-UP
CAL1-UP
LEFT SIDE VIEW
AIR SHUT-OFF
AIR CLEANERS
AIR START SOLENOID
PRELUBE PUMP
ALTERNATOR
ETHER STARTING AID
RIGHT SIDE VIEW
T
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
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.
Normally closed switch that is open due to an applied condition, and will close again
with a specific decrease in that condition.
The circle indicates that the component has screw terminals and a wire can be disconnected
from 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.
This indicates that the component does not have a wire connected to ground. It is grounded
by being fastened to the machine.
Electrical Schematic Symbols And Definitions
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
A AA
2
A AA
1
2
325-PK-14
C
A
325-PK-14
200-BK-14
T
FUSE - A component in an electrical circuit that will open the circuit if too much current flows
through it.
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.
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.
Harness And Wire Electrical Schematic Symbols
Socket
Pin
Pin or Socket
Number
Wire, Cable, or Harness
Assembly Identification
Single Wire
Connector
Circuit Number
Identification
Wire
Gauge
Wire
Color
Plug
Receptacle
9X-1123
Component
Part Number
Electrical Schematic Symbols And Definitions
1
1
1
2
2
Typical representation of a
Sure-Seal connector. The
plugand receptacle contain
both pins and sockets.
Typical representation of a
Deutsch connector. The
plug contains all sockets
and the receptacle contains
all pins.
B B
2
A
B
1
2
1
2
2 1
B
A
2
2
1
B
A
2
1
2
8
7
2
5
4
BA
87
86
30
85 85
30
87
86
1 2
21
2
2
2
2
2
2
200-BK
C465-OR-10
1
1
200-BK-6
200-BK-10
200-BK-10
200-BK-6
2
1
2
1
1
2
1
3 4
2
3 4
1
2
BK-00
BK-00
304-WH-18
200-BK-18
1
2
BK-00 BK-00
BK-00
31
04
33
03
23
25
24
01
11
37
02
12
07
17
27
06
16
26
09
19
39
08
18
38
10
20
40
13
15
14
21
22
35
36
34
382-PK-14
708-YL
306-GN-14
306-GN
101-RD-14
101-RD-14
229-BK
229-BK-14
229-BK-14
306-GN-14
ETHER SOLENOIDS
ASO RELAYS-86
STARTER MOTOR MAGC SW. // CSC B-1
CRANK SIGNAL CONNECTOR A-1
ELECTRONIC GOVERNOR ACTUATOR-2
ELECTRONIC GOVERNOR ACTUATOR-1
ELECTRONIC GOVERNOR ACTUATOR-SH
POWER (+)
POWER (+)
POWER (-)/LO
POWER (-)
POWER (-)
LH MPU-2
LH MPU-1
LH MPU-SH
RH MPU-2
RH MPU-1
RH MPU-SH
ENGINE COOLANT TEMP SENSOR A
ENGINE COOLANT TEMP SENSOR B
ENGINE COOLANT TEMP SENSOR C
ENGINE COOLANT LEVEL SENSOR A
ENGINE COOLANT LEVEL SENSOR B
ENGINE COOLANT LEVEL SENSOR C
ENGINE OIL PRESSURE SENSOR A
ENGINE OIL PRESSURE SENSOR B
ENGINE OIL PRESSURE SENSOR C
ENGINE OIL TEMP SENSOR A
ENGINE OIL TEMP SENSOR B
ENGINE OIL TEMP SENSOR C
NOTES BLOCK
L1
L2
L3
L4
ENGINE SENSORS
SMARTLINK
MPU(S)
GOVERNOR ACTUATOR
229-BK-10
200-BK-10
9X9584
RESISTOR AS.
9X7137
VALVE AS.
1
2
3
- BATT
+ BATT
SOLENOID
9X3207
CONTROL GP
9X9584
RESISTOR AS.
2
3
1
+ BATT
SOLENOID
CONTROL GP
- BATT
9X3207
VALVE AS.
9X7137
3E7298
SWITCH AS.
200-BK-14
A289-BK-14
NOTE A
NOTE B : IF ENGINE IS NOT EQUIPED WITH PRELUBE
CONNECT CONNECTORS A AND B TOGETHER
382-PK-14
AIR SHUT-OFF
RELAY LH
AIR SHUT-OFF
SOLENOID RH
AIR SHUT-OFF
SOLENOID LH
AIR SHUT-OFF
200-BK
200-BK
708-YL
852-TN-14
852-TN-10
852-TN-14
852-TN-14
LHASOCB
RHASOCB
852-TN-14
852-TN-14
852-TN-14
BOX GP JUNC
148-8025
709-OR-18
A235-BK-18
995-WH-18
799-WH-18
220-BK-18
M985-GN-18
CRANK SIGNAL CONN
995-BU-18
A235-BK-18
709-OR-18
C527-OR-18
221-BK-18
E452-WH-18
M985-BU-18
220-BK-18
799-WH-18
F411-GN-18
B482-BR-18
G429-GN-18
L3
L3
A235-BK-18
709-OR-18
995-BU-18
E452-WH-18
221-BK-18
C527-OR-18
799-WH-18
220-BK-18
M985-BU-18
G429-GN-18
B482-BR-18
306-GN
306-GN
306-GN
200-BK-14
200-BK-14
229-BK
T
2
1
WH-18
BK-18
839-RD-18
839-BK-18
839-SH-18
838-BK-18 BK-18
1
838-SH-18
838-RD-18
2
WH-18
LH MPU
6V-2455
6V-2455
RH MPU
1
2
RD-14
BK-14G807-BK-18
G807-SH-18
G807-RD-18
GOVERNOR
ACTUATOR
7W6722
838-SH-18
838-BK-18
838-RD-18
839-SH-18
839-BK-18
839-RD-18
L2
G807-SH-18
G807-BK-18
G807-RD-18
L1
200-BK-10
708-YL
708-YL
5N-5692
101-RD-14
101-RD-14
4P2729
L2
L1
NOTE B
ARE FOR 3516 ENGINES ONLY
NOTE A : COMPONENTS WITHIN THIS LINE
32
30
29
28
05
304-WH-10
Relay RH
F411-GN-18
B482-BR-18
F411-GN-18
G429-GN-18
C527-OR-18
E452-WH-18
221-BK-18
DEVICENET DRAIN
DEVICENET CAN_L
DEVICENET CAN_H
DEVICENET V-
DEVICENET V+
M757-CU-19
M755-GN-19
M756-YL-19
M753-BK-16
M754-RD-16
M754-RD-16
M753-BK-16
M756-YL-19
M755-GN-19
M757-CU-19
L4
CONNECTORS
SMARTLINK
134-2540 RESISTOR RECEPTACLE
A A
C C
1
SMARTLINK ADAPTER
TO THERMOCOUPLE
AND HARNESS
155-2276 WEDGE ASSEMBLY
155-2261 WEDGE ASSEMBLY
155-2269 PLUG ASSEMBLY
169-8670 PLUG ASSEMBLY
ENGINE
OIL
TEMP
SENSOR
102-0050
(EMCPII USE)
177-0071
6V-5049
9X-3271
(SMARTLINK USE)
EMCPCB
25A
VS
GND
SIGNAL
VS
GND
ALARM
VS
GND
SIGNAL
VS
GND
SIGNAL
B
A
C
B
A
C
B
A
C
20A
20A
1
1
1
1
1
1
CONNECTOR
GENERATOR
8T9834
L4
BK-6BK-6
RD-6
104-RD-10
104-RD-10
PRELUBE
PRESSURE
SWITCH
150-1240
PPR-SPPR-M
PRELUBE CONTROL
(148-8028)
314-PU-10
109-RD-6
109-RD-6
+
R
ALT
45A
POWER DISTRIBUTION BOX
MAG
RELAY
CIRCUIT BREAKER
40A60A
ALTCB
30A
PRELUBECB
STARTER
SMMS2
MAG SWITCH
MAG SWITCH
STARTER
SMMS1
(147-3348)
(+)
(-)
RD-00
C
B
A
POS NEG
MOTOR
BATMTR
SG
RD-00
AIR STARTER
SOLENOID
5N-8980
1/2 MOTOR GP.
8N-3896 (3512/6)
7C-0527 (3508)
1/2 MOTOR GP.
8N-3896 (3512/6)
7C-0527 (3508)
RD-00
304-WH-10
CUSTOMER
SUPPLIED
+
PRELUBE
MOTOR AS.
3T-3735
ATTACHMENTS
MOTOR
DISCONNECT
SWITCH
7N-0718
NEGPOS
RD-00
ENGINE
OIL
PRESSURE
SENSOR
145-2362
(EMCPII USE)
161-9931
(SMARTLINK USE)
ENGINE
COOLANT
TEMP
SENSOR
102-0050
(EMCPII USE)
177-0071
6V-5049
9X-3271
(SMARTLINK USE)
ENGINE
COOLANT
LEVEL
SENSOR
165-6634
109-RD-6
THIS SCHEMATIC IS FOR THE 3500 (MUI) ENGINES BUILT
FOR CATERPILLAR GENERATOR SETS (195-9743 CHG00
MOTOR
