5 - 1
5 Electrical Troubleshooting
Table of Contents
SECTION 5. ELECTRICAL TROUBLESHOOTING
SECTION CONTENTS
Introduction
Tools Needed .....................................................................................5-2
System Description ............................................................................5-2
Principals Of Operation
Ignition System...................................................................................5-2
Charging System................................................................................5-2
Cranking System ................................................................................5-2
Safety Interlock System......................................................................5-2
Operation............................................................................................5-2
Checking Out The System
General...............................................................................................5-3
Test Series .........................................................................................5-3
Lower Wire Harness Explosion Diagram ...............................5-4
Upper Wire Harness Explosion Diagram................................5-6
1. Checking the Power Supply
A. Wiring.............................................................................................5-8
B. Battery Tests..................................................................................5-8
C. Battery Cables ...............................................................................5-9
2. Isolate Starting and Safety Systems ..................................5-10
3. Checking the Cranking System
A. Test Circuit Breaker .......................................................................5-10
B. Test Power to Ignition Switch.........................................................5-11
C. Test Ignition Switch........................................................................5-11
D. Test Power to Solenoid..................................................................5-12
E. Test Solenoid .................................................................................5-13
F. Solenoid Bench Test ......................................................................5-13
G. Test Power To Starter ...................................................................5-14
4. Test Safety Interlock System
A. PTO Interlock Switch .....................................................................5-15
B. Seat Switch (Mechanical) ..............................................................5-15
C. Seat Switch (Electrical)..................................................................5-16
D. Clutch/Brake Switch (Mechanical) ................................................5-16
E. Clutch/Brake Switch (Electrical)....................................................5-16
F. Neutral Safety Switch (Mechanical) ...............................................5-17
G. Neutral Safety Switch (Electrical) ..................................................5-17
H. Interlock Module ............................................................................5-18
5. Misc. Tests
A. Headlights ......................................................................................5-18
B. Power to Headlights.......................................................................5-18
C. Headlight Switch ............................................................................5-19
D. Hour Meter.....................................................................................5-19
E. Power to Hour Meter......................................................................5-20
F. Inspect and Replace Dash Lights ..................................................5-20
G. Test Electric PTO Clutch ...............................................................5-21
6. Wiring Diagrams..........................................................................5-22
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