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TM 10-3930-671-24
6.12. Starter Motor Troubleshooting
On-Vehicle Troubleshooting................................................................................................ F-307
Starter Motor Tests.............................................................................................................. F-307
Starter Solenoid Volt Drop Test........................................................................................... F-308
Starter No-Load Test........................................................................................................... F-309
No-Load Test Diagnosis...................................................................................................... F-310
Starter Disassembly ............................................................................................................ F-310
On-Vehicle Troubleshooting
For additional information please refer to:
•
Section 2. 1t Service Specifications
•
Section 4.3t Engine Tune-Up
•
Section 6. 1t Electrical System Wiring
• Section 6. 11t Starting System Troubleshooting.
• Battery service must be done by
trained personnel.
• Battery acid can cause severe burns
and injury.
• Remove all jewelry (watch, rings, bracelets, etc.) before
working on electrical systems. Severe burns
can result from contact with electrical circuits.
NOTE
To perform this service procedure, it
is recommended that you first:
• Park truck safely.
• Apply parking brake and block drive wheels.
• Return all controls to neutral and turn ignition key
OFF, except as otherwise noted.
Always follow the manufacturer's instructions for the
test instrument being used when making connections
and tests on electrical circuits.
Minimum Tools Required
• Digital voltmeter.
• Volt-ohm meter.
• Battery tester.
Disconnect the fuel shut-off solenoid. This will prevent
the engine from accidentally being started while
performing starting system electrical checks and
cranking tests.
Starter Motor Tests
1.
Starter Solenoid Volt Drop Test
Use the lowest volt scale on the voltmeter to measure
the solenoid voltage while the starter is cranking
the engine
F-307
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