©2000 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR3539
FEBRUARY 2000
303.5 and 304.5
Electrical System
303.5:
AKL1-UP
304.5:
ANR1-UP
Mini Hydraulic Excavator
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Distribution Circuits Monitoring Circuits
101 RD Bat (+) 405 GY Oil Press Low Lamp
103 YL Lamp Rly Coil 430 BU Air Cleaner Lamp
104 YL Console Lamp Pwr 441 OR Eng Temp Gage
105 RD Key Sw Pwr 447 PK Fuel Level Gage
109 RD Alt Out Positive C444 YL Alt Indicator Lamp
112 PU Main Pwr Rly Out Accessory Circuits
114 RD Fwd Horn Pwr 500 BR Wiper Front Park
117 RD Main Breaker Pwr 501 GN Wiper Front Low
118 GY Wiper/Washer Pwr 506 PU Washer Motor
119 PK Fuel Shutoff Pwr 508 PU Radio Speaker L+
122 RD Dome Lamp Pwr 509 WH Radio Speaker L-
125 OR Boom Lower Pwr A584 BU Interlock Sw
130 GN Heater Pwr Lighting Circuits
131 BR Solenoid Pwr 603 PK Beacon
135 BU Radio Pwr 607 PK Flood Lamps
144 GN Beacon Pwr Control Circuits
Ground Circuits E783 WH Boom Lower
200 BK Main Chassis H792 BR Dash/Flood Lamp Sw
877 YL Glow Plugs
304 WH Starter Relay Out E953 GY Speed Select Sw
306 GN Start Rly Coil G981 PU Travel Alarm Disable
307 OR Start Disable Rly L987 WH Start Aid Rly Coil
308 YL Main Pwr Rly Coil M927 GN Hyd Disable Sol
321 BR Travel Alarm P977 PK Hyd Dis Rly Coil
322 GY Fwd Horn
Basic Machine Circuits
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Alarm - Travel B-5 8 Relay - Start C-9 8
Alternator D-9 2 Relay - Start Aid C-9 8
Alternator Breaker D-9 8 Relay - Start Disable C-7 5
Assembly - Heater Blower C-3 3 Sender - Coolant Temperature D-9 2
Battery B-9 4 Sender - Fuel Level E-6 13
breaker - Lighting D-4 5 Solenoid - Boom Lower B-5 11
Breaker - Main D-3 5 Solenoid - Fuel Shutoff E-9 7
Engine GND Strap-Rear Frame GND B-8 6 Solenoid - Hydraulic Disable B-8 9
Fuses D-3,4,5 5 Solenoid - Speed Select B-8 9
Glow Plugs C-9 7 Switch - Air Inlet Pressure E-9 9
Ground - Front Frame B-8 4 Switch - Beacon E-3 B
Ground 2 - Front Frame A-9 4 Switch - Dash & Flood Lamp C-4 A
Group - Gauge Cluster C-4 A Switch - Horn C-4 A
Horn E-6 1 Switch - Interlock B-2 10
Motor - Starter C-9 12 Switch - Key Start C-4 A
Motor - Washer E-9 9 Switch - LH Console D-4 16
Motor - Wiper B-2 10 Switch - Oil Pressure E-9 7
Relay - Boom Lower B-5 5 Switch - Speed Select D-2 14
Relay - Hydraulic Disable C-7 5 Switch - Travel D-2 19
Relay - Lamp C-7 5 Switch - Wiper/Washer E-4 B
Relay - Main Power D-3 5 Switch 2 - Travel D-2 19
Machine locations are repeated for components located close together.
A = Located in or on the right console.
B = Located in or on the left console.
Connector Location
Connector Number
Schematic
Location
Machine
Location
CONN 1 E - 8 2
CONN 2 B - 7 A
CONN 3 C -7 B
CONN 4 C - 7 B
CONN 5 C - 7 B
CONN 6 D - 7 B
CONN 7 B - 5 11
CONN 8 D - 2 19
CONN 9 D - 2 18
CONN 10 D - 2 18
The connectors shown in this chart are for harness to harness connectors.
Connectors that join a harness to a component are generally located at or near the
component. See the Component Location Chart.
11
1
1
2
2
3
3
5
5
6
6
7
7
8
9
10
10
12
13
13
14
16
A
A
B
B
17
17
12
4
4
8
8
14
14
5
6
15
15
18
18
1111
12
9
16
19
19
Machine Harness Connector And Component Locations
1
2
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.
325-L25 PK-14
200-L32 BK-14
325-A135 PK-14
AG-C4
111-7898
L-C12
3E-5179
AG-C4
111-7898
L-C12
3E-5179
C-C4
130-6795
*
*
*
*
*
*
*
Harness And Wire Electrical Schematic Symbols
Electrical Schematic Symbols And Definitions
9X-1123
Part Numbers For
Connector Assembly
Component
Part Number
Wire, Cable, or Harness
Assembly Identification
Circuit Number
Identification
Wire
Color
Single Wire
Connector
Wire
Gauge
2
Socket
Pin
Pin or Socket
Number
Plug
Receptacle
1
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.
AG-C3
130-6795
Harness identification letter(s) and a
serializing code. The "C" stands for
connector and the number indicates
which connector in the harness.
Harness identification code
This example indicates wire
32 in harness "L'.
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
1
2
RIGHT CONSOLE
200-CA15 BK-18
200-CA17 BK-18
607-CA13 PK-18
607-CA18 PK-18
LEFT CONSOLE
607-FF1 PK-18
200-FF2 BK-18
607-CA4 PK-18
603-CA1 PK-18
200-CA20 BK-18
200-CA6 BK-16
200-C15 BK-18
607-C13 PK-18
509-C28 WH-18
508-C27 PU-18
501-C7 GN-18
118-C11 GY-18
A584-C5 BU-18
607-C4 PK-18
122-C3 RD-18
122-C3 RD-18
122-C3 RD-18
607-C4 PK-18
501-C7 GN-18
118-C11 GY-18
A584-C5 BU-18
200-C8 BK-18
118-C11 GY-18
A584-C5 BU-18
607-C4 PK-18
501-C7 GN-18
200-C8 BK-18
A584-C9 BU-18
603-C1 PK-18
603-C1 PK-18
135-C2 BU-18
135-C2 BU-18
122-C14
RD-18
122-C12 RD-18
200-C10 BK-18
200-C23 BK-18
200-C24 BK-18
200-C20 BK-18
200-C6 BK-16
200-C6 BK-16
200-C6 BK-16
135-C2 BU-18
200-C20 BK-18
405-F38 GY-18
405-F38 GY-18
200-F33 BK-18
131-F37 BR-18
200-F13 BK-18
447-F32 PK-18
200-F7 BK-18
441-E16 OR-18
405-E18 GY-18
119-E20 PK-18
430-F41 BU-18
109-E22 RD-6
101-E26 RD-6
101-CG1 RD-00
109-F50 RD-6
109-F50 RD-6
200-F6 BK-18
125-F36 OR-18
E953-F34 GY-18
200-F35 BK-18
447-F32 PK-18
322-F30 GY-18
125-F36 OR-18
200-F3 BK-18
308-E11
YL-18
308-E11 YL-18
109-F50 RD-6
308-E11 YL-18
441-E16 OR-18
405-E18 GY-18
119-E20 PK-18
430-F41 BU-18
200-CF1 BK-00
322-A15 GY-18
114-A3 RD-18
104-A8 YL-18
135-A2 BU-18
135-A2 BU-18
125-A16 OR-18
135-A2 BU-18
104-A8 YL-18
114-A3 RD-18
114-A3 RD-18
104-A8 YL-18
322-A15 GY-18
322-A15 GY-18
322-A15 GY-18
144-A64 GN-18
144-A64 GN-18
130-A25 GN-14
119-A7 PK-18
119-A7 PK-18
122-A63 RD-18
122-A63 RD-18
131-A1 BR-18
109-A17 RD-6
109-A17 RD-6
H792-A22 BR-18
H792-A22 BR-18
430-A23 BU-18
430-A23 BU-18
430-A23 BU-18
430-A23 BU-18
441-A24 OR-18
441-A24 OR-18
441-A24 OR-18
441-A24 OR-18
447-A26 PK-18
447-A26 PK-18
447-A26 PK-18
447-A26 PK-18
405-A27 GY-18
405-A27 GY-18
405-A27 GY-18
405-A27 GY-18
405-A28 GY-18
405-A28 GY-18
405-A28 GY-18
405-A28 GY-18
308-A4 YL-18
308-A4 YL-18
308-A34 YL-18
308-A34 YL-18
307-A19 OR-18
307-A19 OR-18
307-A19 OR-18
131-A41 BR-18
P977-A39 PK-18
P977-A35 PK-18
130-A25 GN-14
607-A31 PK-18
607-A31 PK-18
118-A29 GY-18
118-A29 GY-18
A584-A33 BU-18
A584-A33 BU-18
A584-A33 BU-18
501-A32 GN-18
501-A32 GN-18
501-A32 GN-18
603-A30 PK-18
603-A30 PK-18
603-A30 PK-18
200-A37 BK-18
405-A42 GY-18
506-F28 PU-18
C444-E35 YL-18
C444-E35 YL-18
C444-E35 YL-18
506-A43 PU-18
506-A43 PU-18
506-A43 PU-18
200-A44 BK-18
200-A44 BK-18
H792-A47 BR-18
H792-A47 BR-18
H792-A46 BR-18
H792-A46 BR-18
H792-A45 BR-18
200-A48 BK-14
200-A48 BK-14
200-A49 BK-18
200-A49 BK-18
200-A50 BK-14
200-A50 BK-14
L987-A51 WH-18
L987-A51 WH-18
L987-A51 WH-18
C444-A52 YL-18
C444-A52 YL-18
C444-A52 YL-18
C444-A52 YL-18
200-A53 BK-18
200-F40 BK-18
200-A54 BK-18
200-A55 BK-16
200-A55 BK-16
131-A57 BR-18
405-E18 GY-18
441-E16 OR-18
119-E20 PK-18
430-F41 BU-18
200-F40 BK-18
130-A25 GN-14
322-F30 GY-18
105-A58 RD-18
105-A58 RD-18
105-A58 RD-18
105-A58 RD-18
200-F40 BK-18
117-A65 RD-10
117-A67 RD-6
200-A53 BK-18
112-A18 PU-14103-A5 YL-14
109-A17 RD-6
H792-A46 BR-18
144-A64 GN-18
119-A7 PK-18
308-A34 YL-18
308-A4 YL-18
122-A63 RD-18
200-A53 BK-18
103-A5 YL-14
131-A57 BR-18
131-A56 BR-18
104-A8 YL-18
125-A16 OR-18
114-A3 RD-18
130-A25 GN-14
308-A4 YL-18
131-A41 BR-18
H792-A46 BR-18
118-A29 GY-18
NOTE B
CANOPY HARNESS
A584-A59 BU-18
L987-A61 WH-18
L987-A60 WH-18
L987-A61 WH-18
L987-A60 WH-18
500-C19 BR-18
500-C19 BR-18
500-C19 BR-18 500-A62 BR-18
500-A62 BR-18
500-A62 BR-18
607-A31 PK-18
607-C18 PK-18
200-C17 BK-18
607-C18 PK-18
200-C17 BK-18
135-A2 BU-18
308-A34 YL-18
119-A7 PK-18
103-A5 YL-14
131-A57 BR-18
122-A63 RD-18
118-A29 GY-18
109-A17 RD-6
125-A16 OR-18
501-A32 GN-18
200-A44 BK-18
603-A30 PK-18
506-A43 PU-18
500-A62 BR-18
A584-A33 BU-18
131-A41 BR-18
H792-A46 BR-18
P977-A39 PK-18
144-A64 GN-18
105-A58 RD-18
122-A63 RD-18
112-A69 PU-10
112-A68 PU-10
109-A17 RD-6
200-A53 BK-18
103-A5 YL-14
308-A4 YL-18
308-A34 YL-18
308-A36 YL-18
114-A3 RD-18
125-A16 OR-18
THIS SCHEMATIC IS FOR THE 303.5 AND THE 304.5
(163-6945 CH 01)
COMPONENTS ARE SHOWN INSTALLED ON A FULLY OPERABLE
MACHINE WITH THE KEY AND ENGINE OFF.
IDENT PART NO. CHG NOTE
A
C
CA
F
FF
HARNESS AS.
CABLE AS.
02 C
02
02
04 C
02
01 CCF
163-9817
NAME
FUSE BOX
CAB/ENCLOSED
CANOPY/OPEN
FRAME
BOOM
MACHINE GROUND
E 01 CENGINE (303.5)
ALL DASHED LINES ARE ATTACHMENTS
NOTE A: RADIO TO BE INSTALLED BY DEALER
NOTE C: HARNESS AS. OR CABLE AS. PART OF
WIRING GP-BATTERY (303.5 : 158-5723, 304.5 : 154-7807)
NOTE D: CABLE PART OF SWITCH GP-DISCONNECT
NOTE E: COMPONENT IS STANDARD WHEN CAB HARNESS IS INSTALLED.
01CG BATTERY TO STARTER C
NOTE B: SWITCH IS SHOWN WITH CONSOLE IN THE RAISED POSITION.
NOTE A
WIRE AS.
01 CWA 158-7833 HI SPEED TRAVEL SWITCH
131-WA1 BR-18
E953-WA2 GY-18
200-A54 BK-18
200-A9 BK-14
200-A9 BK-14
200-A10 BK-14
200-A10 BK-14
A584-C16 BU-18
501-C7 GN-18
500-C19 BR-18
200-C23 BK-18
200-C10 BK-18
508-C27 PU-18
509-C28 WH-18
E783-F52 WH-16
308-A11 YL-18
308-A11 YL-18
308-A11 YL-18
308-A11 YL-18
308-A11 YL-18
G981-F51 PU-18
E953-F34 GY-18
131-F37 BR-18
131-F39 BR-16
G981-F51 PU-18
ENGINE
ENGINE
ENGINE
ENGINE
LEFT CONSOLE
RIGHT CONSOLE
RIGHT CONSOLE
200-F35 BK-18
CONNECTS TO A-C18 AT C-7
200-F1 BK-18
ENGINE
FUSES
9W-1442 10A
603-A30
PK-18
ABBREV COLOR
RD RED
WH WHITE
OR ORANGE
YL YELLOW
PK PINK
BK BLACK
GY GRAY
PU PURPLE
BR BROWN
GN GREEN
BU BLUE
321-WC1 BR-18
200-WC2
CONN 7
BK-18
00 CWC 169-5349 ALARM
9W-1441 15A
607-A31 PK-18
307-A19 OR-18
P977-A35 PK-18
103-A5 YL-14
H792-A22 BR-18
131-A57 BR-18
125-F36 OR-18
405-F38 GY-18
447-F32 PK-18
322-F30 GY-18
200-F5 BK-16
200-F3 BK-18
200-F29 BK-18
877-E7 YL-10
109-E3 RD-10
109-E3 RD-10
109-E3 RD-10
304-E6 WH-10 109-E4 RD-10
109-E4 RD-10
109-E4 RD-10
200-E2 BK-18
200-E2 BK-18
200-E2
BK-18
200-E1 BK-18
200-E1 BK-18
200-E1 BK-18
L987-E5 WH-18
L987-E5 WH-18
L987-E5 WH-18
307-F16 OR-16
307-F16 OR-16
P977-F15 PK-18
P977-F15 PK-18
200-F23 BK-18
200-F22 BK-18
200-F14 BK-18
131-F25 BR-16
131-F26 BR-18
307-F16 OR-16
200-F14 BK-18
H792-F12 BR-18
103-F9 YL-14
103-F9 YL-14
607-F17 PK-18
607-F17 PK-18
607-F8 PK-18
P977-F19 PK-18
H792-F12 BR-18
P977-F15 PK-18
607-F8 PK-18
607-F18 PK-14
H792-F12 BR-18
607-F18 PK-14
200-F21 BK-18
200-F29 BK-18
M927-F24 GN-18
306-F27 GN-16
306-F27 GN-16
306-F27 GN-16
306-E8 GN-18
306-E8 GN-18
306-E8 GN-18
109-E3 RD-10
109-E4 RD-10
131-F31 BR-18
131-F25 BR-16
200-F14 BK-18
P977-F20 PK-18
103-F9 YL-14
200-F13 BK-18
200-F33 BK-18
E953-F34 GY-18
131-F26 BR-18
607-F17 PK-18
200-F35 BK-18
200-F1 BK-18
154-3192
154-3191
163-9818
163-9819
171-0598
169-1225
169-1224
131-F31 BR-18
200-F5 BK-16
P977-F19 PK-18
P977-F20 PK-18
307-F16 OR-16
306-F27 GN-16
200-F14 BK-18
405-F38 GY-18
E953-F34 GY-18
125-F36 OR-18
103-F9 YL-14
101-E26 RD-6
101-E26 RD-6
101-E26 RD-6
ENGINE
200-F11 BK-18
200-F11 BK-18
321-F10 BR-18
321-F10 BR-18
CONN 8
CONN 9
CONN 10
200-F11 BK-18
321-F10 BR-18
200-F35 BK-18
607-F17 PK-18
E953-F34 GY-18
200-C23 BK-18
NOTE ENOTE E
200-CE1 BK-00
DISCONNECT SW ATCH
TO BATTERY
200-CC1 BK-00
DISCONNECT SW ATCH
00 DCC BATTERY TO DISCONNECT
00CE DISCONNECT TO GROUND D
ATCH
ATCH
NOTE E
NOTE E
506-F28 PU-18
430-F41 BU-18
405-F42 GY-18
119-F43 PK-18
441-F44 OR-18
C444-F45 YL-18
308-F46 YL-18
L987-F47 WH-18
200-F48 BK-14
200-F49 BK-14
H792-F12 BR-18
131-F31 BR-18
506-F28 PU-18
200-F5 BK-16
607-F8 PK-18
200-F3 BK-18
200-F29 BK-18
506-F28 PU-18
C444-F45 YL-18
308-F46 YL-18
L987-F47 WH-18
405-F42 GY-18
441-F44 OR-18
200-F48 BK-14
306-F27 GN-16
200-F49 BK-14
119-F43 PK-18
131-F31 BR-18
430-F41 BU-18
506-F28 PU-18
H792-F12 BR-18
306-F27 GN-16
877-E7 YL-10
200-F4 BK-18
200-F4 BK-18
200-F2 BK-18
200-F2 BK-18
308-F46 YL-18
C444-F45 YL-18
L987-F47 WH-18
405-F42 GY-18
441-F44 OR-18
200-F4 BK-18
306-F27 GN-16
200-F2 BK-18
119-F43
CONN 1
CONN 6
CONN 5
CONN 4
CONN 2
CONN 3
PK-18
131-F31 BR-18
430-F41 BU-18
506-F28 PU-18
H792-F12 BR-18
131-F31 BR-18
H792-F12 BR-18
M927-F24 GN-18
304-E6 WH-10
101-CG1 RD-00
109-E22 RD-6
101-E26 RD-6
200-A48 BK-14
308-A11 YL-18
130-A25 GN-14
135-A2 BU-18
144-A64 GN-18
125-A16 OR-18
118-A29 GY-18
130-A25 GN-14
119-A7 PK-18
104-A8 YL-18
117-A67 RD-6
200-A53 BK-18
109-A17 RD-6
144-A64 GN-18
A584-A59 BU-18
A584-A33 BU-18
500-A62 BR-18
200-A37
BK-18
H792-A45
BR-18
122-C12 RD-18
200-C23 BK-18
200-F7 BK-18
200-F23 BK-18
200-F22 BK-18
306-F27 GN-16
200-F21 BK-18
607-F18 PK-14
603-C1 PK-18
135-C2 BU-18
122-C3 RD-18
118-C11 GY-18
200-C6 BK-16
607-C4 PK-18
200-CA6 BK-16
607-CA4 PK-18
G981-G1 PU-18
321-G2 BR-18
G981-G3 PU-18
321-G4 BR-18
200-F1 BK-18
131-F39 BR-16
E783-F52 WH-16
E783-F52 WH-16
103-F9 YL-14
200-F14 BK-18
306-F27 GN-16
307-F16 OR-16
H792-F12 BR-18P977-F15 PK-18
607-F8 PK-18
131-F31 BR-18
125-F36 OR-18
405-F38 GY-18
200-F5 BK-16
200-F13 BK-18
200-F33 BK-18
E953-F34 GY-18
103-F9 YL-14
200-F14 BK-18
306-F27 GN-16
307-F16 OR-16
H792-F12 BR-18
P977-F19 PK-18
P977-F20 PK-18
607-F18 PK-14
131-F25 BR-16
131-F26 BR-18
607-F17 PK-18
125-F36 OR-18
405-F38 GY-18
200-F1 BK-18
200-F11 BK-18
200-F35 BK-18
E953-F34 GY-18
131-F31 BR-18
200-F13 BK-18
200-F5 BK-16
607-F8 PK-18
P977-F15 PK-18
200-F33 BK-18
M927-F24 GN-18
M927-F24 GN-18
M927-F24 GN-18
M927-F24 GN-18
NEGPOS
12V BATTERY
153-5656
GLOW PLUGS
153-6643
G S
MTR BAT
MOTOR
STARTER
144-9966 (303.5)
REAR FRAME GND 1
M10 GND STUD
BOOM FLOOD LAMP
152-8180
10
SOLENOIDS
10
BEACON
10
CONSOLE
10
HORN
OIL PRESS SW
153-6616
B+
ALTERNATOR
144-9952
L I P
BEACON SWITCH
109-2350
HORN SWITCH
156-8143
T
COOLANT TEMP SENDER
120-0667
STARTER GND
1 2 3
E-C3
1073134
FUEL SHUTOFF SOL
153-6409
SPEED SELECT SOL
144-5986
LH CONSOLE SW
176-1517
AIR INLET PRESS
151-8367
A
B
F-C19
1003320
1
2
A-C16
1552269
LAMP RELAY
115-1615
+BATTERY
GROUND
HEATER BLOWER
146-6372
KEY SWITCH (ON)
1
2
FF-C1
3E3364
1
2
F-C6
1552269
60
ALTERNATOR BREAKER
171-2208
START RELAY
115-1615
START AID RELAY
115-1615
FUEL LEVEL SENDER
169-1236
2
1
F-C11
1552269
SPEED SELECT SW
3T-3132
10
FUEL SHUTOFF
COOLANT
TEMP
FUEL
LEVEL
C
H
C
H
SERVICE
HOUR
1
2
3
4
PU WH
BK
GN YL
BU YL
-+
BU WH
BU WH
1
2
RW
GR
WH BK
GN WH
GN WH
GN WH
GN WH
GN WH
GN WH
WH BK
GN YL
YL
DASH & FLOOD LAMP SW
BK
BK
GN YL
BK
PK WH
GN YL
BK
YL BK
GN YL
I
S
G
I
S
G
GN YL
BU YL
GN BK
YL WH
BR YL
PK WH
BU YL
GN WH
DASH LIGHT
AIR CLEANER
GLOW PLUG
ALTERNATOR
OIL PRESSURE
BK
BK
BK
BK
BK
YL WH
BK
GN BK
BK
YL
TRANSISTER
UNIT
GAUGE GROUP CLUSTER
143-2267
GN BK
4
7
9
10
11
12
8
5
3
2
1
6
A-C17
1552252
1
2
3
4
5
6
7
8
9
10
11
12
CA-C1
3E5179
ANTENNA
8E-1118
DOME LAMP
084-4277
RIGHT CAB FLOOD LAMP
146-6366
LEFT CAB FLOOD LAMP
146-6366
ANTENNA
LEFT SPKR -
RIGHT SPKR -
GROUND
+B MEMORYYL
BK
GY/BK,VI/BK
GY/VI
RD
WH/BK,BN/BK
WH/GN
RIGHT SPKR +
LEFT SPKR +
+ BATTERY (12V)
NC
RADIO
126-4953
SPEAKER
6T-7695
-
+
8
7
3
2
1
6
5
4
C-C2
1552264
GND
B+
P
T
MOTOR
L
GN
YL
BK
RD
WIPER
146-6431
1
F-C18
1275483
1
A-C3
1275484
2
1
F-C8
1552269
1
2
3
4
5
6
7
8
9
10
11
12
C-C5
3E5179
2
1
C-C6
1552269
3
1
4
2
C-C3
1552272
-
+
TRAVEL ALARM
161-2539
HYDR DISABLE SOL
144-5986
-
+
FWD HORN
7T-0635
2
3
5
6
7
8
A-C2
1117898
1
4
1
2
3
4
5
6
7
8
9
10
11
12
A-C18
1552252
10
KEY START
2
3
5
6
7
8
A-C1
1117898
1
4
E-C8
9X1054
4
2
3
1
5
E-C9
9X1054
4
2
3
1
5
F-C3
3E5519
4
5
3
1
2
F-C5
9X1054
4
5
3
1
2
F-C9
9X1054
4
5
3
1
2
15263748
A-C7
9W2035
MAIN POWER RELAY
168-7908
20
LIGHTING BREAKER
9H-1958
60
MAIN BREAKER
9S-0174
INTERLOCK SW
146-6442
BEACON SOCKET
9R-7941
BEACON
128-6985
BEACON SOCKET 2
9R-7941
BEACON 2
128-6985
1
2
WA-C1
1552269
1
2
F-C1
3E3364
15263748
A-C8
9W2035
15263748
A-C9
9W2035
1
2
F-C7
1552272
3
4
2
1
A-C11
3E3364
1
2
A-C10
1552252
3
4
5
6
7
8
9
10
11
12
1
2
F-C16
3E5179
3
4
5
6
7
8
9
10
11
12
5
1
A-C13
1552273
2
3
4
6
BOOM LOWER RELAY
115-1615
BR
OR
PU
YL
ST
ON
OFF
B
S
C
R
KEY START SW
154-3197
AID
RD
A
A-C19
1552267
A
B
C
F-C2
3E5519
4
2
3
1
5
LEFT CAB FLOOD LAMP 2
146-6366
RIGHT CAB FLOOD LAMP 2
146-6366
WC-C1
3E3370
1
2
F-C13
1552269
BOOM LOWER SOL
143-2269
FRONT FRAME GND
M8 GND STUD
1
2
F-C14
3E3364
10
RADIO
10
WIPER WASHER
15
HEATER
10
DOMELAMP
START DISABLE
115-1615
HYDR DISABLE
115-1615
FRONT FRAME GND 2
M10 GND STUD
10
BOOM LOWER
1
2
A-C12
1552273
3
4
5
6
1
2
F-C15
3E3382
3
4
5
6
1
2
3
4
5
6
7
8
A-C4
1552264
1
2
F-C10
3E3388
3
4
5
6
7
8
1
2
E-C1
3E5179
3
4
5
6
7
8
9
10
11
12
1
2
F-C17
1552252
3
4
5
6
7
8
9
10
11
12
MOTOR
WASHER
152-1800
1
2
F-C4
7T5957
TRAVEL SW
6T-5925
1
2
3
4
G-C1
3E3376
TRAVEL SW2
6T-5925
DISCONNECT SW
7N-0718
ENGINE GND STRAP
8I-4641 (304.5)
TO ENGINE FRAME
REAR FRAME GND
M12 GND STUD
SYMBOL DESCRIPTION
BLADE, SPADE, RING,
OR SCREW TERMINAL
SPLICE
CIRCUIT NOT CONNECTED
ELECTRICAL CONNECTION
TO MACHINE STRUCTURE
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
CONNECTOR
ATCH WIRE, CABLE,
COMPONENT
CIRCUIT GROUPING
DESIGNATION
H#
WIPER WASHER SW
158-7802
A
B
A-C14
1761477
F-C12
1552267
A
B
C
306-E10 GN-18
L987-E14 WH-18
GLOW PLUG DIODE
106-8704
E 01 CENGINE (304.5)171-0558
185-4202 (303.5) ,
155-9849 (304.5)
LOC
D-4
B-7
F-2
B-6
D-2
A-9
D-9
H-8
H-8
E-5
A-9
D-9
I-8
9 8 7 6 5 4 3 2 1
123456789
A
B
C
D
E
F F
E
D
C
B
A
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS OFF.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS ON.
STARTING CIRCUIT.
GAUGE CIRCUIT.
MONITORING SYSTEM CIRCUIT.
PANEL LAMP CIRCUIT/BEACON.
WASHER/WIPER CIRCUIT.
GROUND CIRCUIT.
START AID CIRCUIT.
ALL DASHED LINES ARE ATTACHMENTS.
