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TM 10-3930-671-24
3.
Check the wiring.
Inspect the wiring for damage. Inspect all connections to
starter motor, solenoid, starter relay, ignition switch,
neutral start switch, any other control switch, and battery,
including ground connections.
Clean and tighten all connections as needed.
4.
Check starter relay (magnetic switch), neutral
start switch, and ignition key switch to determine
their condition. With switches closed, use a
voltmeter to check the circuit for continuity.
Replace defective switches and wiring as
required.
5.
Check fuses.
Starting System Electrical Checks
NOTE
When servicing the starting system,
never remove a unit until tests have
shown it to be defective.
The
following
describes
typical
troubleshooting
procedures for two of the most common starting system
problems.
Slow or Sluggish Cranking
Slow or sluggish cranking is one of the more complex
problems to solve. The battery, wiring, switches, starter
motor and engine are all factors that must be checked to
determine where the problem is.
1.
Disconnect the fuel shut-off solenoid. This will
prevent the engine from accidentally being
started
while
performing
starting
system
electrical checks and cranking tests.
2.
Perform a battery load test. Connect a voltmeter
across the battery terminals. Crank the engine
for 15 seconds. Measure the voltage on the
voltmeter.
See following procedures.
a)
Voltage less than 9.6 volts. Check battery and
connections. If the voltage drops below 9.5-9.7
volts at temperature of 70-80’F [21-27’C]:
(1)
Test the battery with a voltmeter. If the
battery is discharged or suspected of
being defective, charge it and test it per
recommended procedures.
(2)
Replace the battery, if necessary.
(3)
Be sure that the correct battery (size and
rating) is installed in the truck.
(4)
Check for bad connections at battery
terminals.
(5)
Clean and tighten all battery connections.
F-299
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