7 - 1
7 Electrical System Service
Table of Contents
GENERAL INFORMATION
Section Contents ......................................................................... 7-2
System Description.......................................................................7-2
Principles of Operation ................................................................ 7-3
Safety Interlock System ............................................................... 7-3
Checking Out the System ............................................................ 7-4
DIAGRAMS
Exploded View Diagrams..............................................................7-5
Electrical One Line Diagrams .....................................................7-12
Linear Circuit Diagrams ..............................................................7-15
COMPONENT LOCATION AND REPLACEMENT
Dashboard Components.............................................................7-18
Safety Interlock System ............................................................. 7-20
Driving Lights ..............................................................................7-22
Circuit Breakers, Relays, and Timers ........................................ 7-22
Fuel System................................................................................7-23
Engine.........................................................................................7-24
TROUBLESHOOTING
General Information ................................................................... 7-25
Troubleshooting Flow Charts..................................................... 7-26
COMPONENT TESTS
General Testing Information .......................................................7-34
A. Check/Clean Wires and Connectors .....................................7-34
B. Check/Clean Ground Cable...................................................7-34
C. Battery Tests .........................................................................7-35
D. Isolated Battery Voltage Check .............................................7-36
E. Charging Voltage Check........................................................7-36
F. Preheat Timer Test................................................................7-37
G. Glow Plug Relay Test ............................................................7-38
H. Ignition Switch Tests..............................................................7-38
I. PTO Switch Test....................................................................7-40
J. Accessory Power Connector Test .........................................7-41
K. Cruise Control Switch Test ....................................................7-41
L. Height of Cut Switch Test ......................................................7-42
M. Brake Pedal Switch Tests......................................................7-42
N. Seat Switch Safety Interlock Test..........................................7-43
O. Seat Switch Test....................................................................7-43
P. Circuit Breaker Test...............................................................7-44
Q. PTO Clutch ...........................................................................7-44
R. Headlight Switch Test............................................................7-44
S. Fuel Solenoid Test.................................................................7-44
T. Voltage Regulator .................................................................7-44
U. Alternator ..............................................................................7-44
V. Fuel Level Signal Test ...........................................................7-45
W. Fuel Level Sensor Test..........................................................7-45
SECTION 7. ELECTRICAL SYSTEM SERVICE
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