10.4
ELECTRICAL
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
Electrical Service Notes
Keep the following notes in mind when diagnosing an
electrical problem:
• Refer to wiring diagram for stator and electrical
co
mponent resistance specifications.
• When measuring resistance of a component that
has a re
sistance value under 10 Ohms, remember
to subtract meter lead resistance from the reading.
Connect the leads together and record the
resistance. The resistance of the component is
equal to tested value minus the lead resistance.
• Become familiar with the operation of
your meter.
Be sure leads are in the proper jack for the test
being performed (i.e. 10Ajack for current
readings). Refer to the Owner’s manual included
with your meter for more information.
• Voltage, amperage, and resistance values
include
d in this manual are obtained with a Fluke
Ô
77 Digital Multimeter (PV-43568). This meter is
used for when diagnosing electrical problems.
Readings obtained with other meters may differ.
• Pay attention to the prefix on the multimeter
rea
ding (K, M, etc.) and the position of the decimal
point.
• For resistance readings, isolate the component to
be te
sted. Disconnect it from the wiring harness or
power supply.
Troubleshooting
No Spark, Weak or Intermittent Spark
• Spark plug gap incorrect
• Fouled spark plug
• Faulty spark plug cap or poor connection to high
tensio
n lead
• Related wiring loose, disconnected, shorted or
cor
roded
• Engine stop switch or ignition switch faulty
• ETC switch mis-adjusted or faulty
• Wire harness or connections wet, corroded or
br
oken
• Poor ignition coil ground
• Incorrect wiring after repair (inspect color coding in
conn
ectors, etc.)
• Faulty ignition coil windings (measure resistance
of pr
imary and secondary)
• Sheared flywheel key
• Flywheel Loose or damaged
• Excessive crankshaft runout - should not exceed
.002
4”
• Faulty ECU
• Faulty CPS
• Low Battery
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