Troubleshooting – John Deere stx38 User Manual
Page 93
3/21/97
4 - 9
ELECTRICAL
TROUBLESHOOTING
TROUBLESHOOTING
Problem or
Symptom
Check or
Solution
Engine will not crank.
Engine cranks but will
not start.
Engine starts hard or
will not stay running.
Engine misses or runs
Weak or no spark.
Engine will not shut off.
PTO clutch will not
engage or will not
Battery goes dead,
discharges or
Optional headlights will
not turn on or will not
Optional fuel shut-off
solenoid will not open.
Optional fuel shut-off
solenoid will not close.
Engine dies when shift
lever is engaged.
Engine dies when PTO
switch is engaged.
See power circuit test points.
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See cranking circuit test
points.
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Check ground circuit test
points.
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Test battery and connections.
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See ignition circuit test
points.
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See charging circuit test
points.
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See starter tests.
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See PTO circuit test points.
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See optional headlight circuit
test points.
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See optional fuel shut-off
solenoid circuit test points.
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Check for shorted circuit.
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Check for high resistance or
open circuit.
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Check for correct spark plug
and spark plug air gap.
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Check for correct ignition
module to flywheel magnet air
gap.
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Check strength of flywheel
ignition module magnet and/
or flywheel stator magnets.
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See fuel and air system tests
and adjustments.
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Check for stator shorted to
ground.
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Check seat switch is plugged
in and spring inside
connector is good.
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