ELECTRICAL SYSTEM
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SECTION 10
ELECTRICAL SYSTEM
10A Repair, Service Tools, and Materials .............................................................................................................. 1
Materials Required ................................................................................................................................... 1
Specifications ........................................................................................................................................... 1
10B Theory and Diagnostic Information................................................................................................................. 3
Electrical Component Symbols ................................................................................................................ 3
10C Electrical Schematic Component Identification............................................................................................... 7
Electrical Schematic................................................................................................................................. 8
10D Theory of Operation and Sub-Circuit Schematics ........................................................................................ 15
Power Circuit—Theory of Operation ...................................................................................................... 15
Power Circuit Schematic ........................................................................................................................ 16
Glow Plug Circuit—Theory of Operation ................................................................................................ 23
Glow Plug Circuit Schematic.................................................................................................................. 24
Start and Run Circuit—Theory of Operation .......................................................................................... 25
Start Circuit Schematic........................................................................................................................... 26
Run Circuit Schematic—On Seat........................................................................................................... 28
Charging Circuit—Theory of Operation.................................................................................................. 29
Charging Circuit Schematic.................................................................................................................... 30
Mow Circuit—Theory of Operation ......................................................................................................... 33
Mow Circuit Schematic........................................................................................................................... 34
Backlap Circuit—Theory of Operation.................................................................................................... 37
Backlap Circuit Schematic ..................................................................................................................... 38
Raise/Lower Circuit—Theory of Operation ............................................................................................ 41
Raise Circuit Schematic ......................................................................................................................... 42
Lower Circuit Schematic ........................................................................................................................ 44
Four Wheel Drive Circuit—Theory of Operation ....................................................................................47
Four Wheel Drive Circuit Schematic ...................................................................................................... 48
Work Lights Circuit—Theory of Operation.............................................................................................. 49
Work Lights Circuit Schematic ............................................................................................................... 50
Instrumentation Circuit—Theory of Operation........................................................................................ 51
Instrumentation Circuit Schematic ......................................................................................................... 52
10E Failure Analysis ............................................................................................................................................ 55
General .................................................................................................................................................. 55
10F General Instructions...................................................................................................................................... 59
General .................................................................................................................................................. 59
Wire Continuity Test ............................................................................................................................... 60
Resistance Test...................................................................................................................................... 60
10G Battery .......................................................................................................................................................... 61
General .................................................................................................................................................. 61
Charging a Maintenance Free Battery ................................................................................................... 61
Maintenance/Cleaning ........................................................................................................................... 62
Testing.................................................................................................................................................... 62
10H Charging System .......................................................................................................................................... 63
General .................................................................................................................................................. 63
Output Voltage Test ................................................................................................................................ 63
Voltage Test............................................................................................................................................ 64
10I Starter .....................................................................................................................
...................................... 65
General .................................................................................................................................................. 65
Starter Field Test .................................................................................................................................... 65
Starter Bench Test.................................................................................................................................. 65
10J Switches ....................................................................................................................................................... 67
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