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TM 9-2320-312-24-2
Testing and Adjusting Section
The solenoid operation also closes the electric
circuit to the motor. Connect one lead of the
multimeter to the terminal connection of the solenoid
that is fastened to the motor. Touch the other lead
to a good ground. Activate the starting solenoid
and look at the multimeter. A reading of the battery
voltage shows that the problem is in the motor. The
motor must be removed for further testing. A zero
reading on the multimeter shows that the solenoid
contacts do not close. This is an indication of the
need for repair to the solenoid or an adjustment to
be made to the pinion clearance for the starting
motor.
Perform a test. Fasten one multimeter lead to the
g00283566
Illustration 93
terminal connection for the small wire at the solenoid
and fasten the other lead to the ground. Look at
6V-7070 Digital Multimeter or the 146-4080 Digital Multimeter
the multimeter and activate the starting solenoid. A
The 6V-7070 Digital Multimeter or the 146-4080
voltage reading shows that the problem is in the
Digital Multimeter is a hand-held service tool with
solenoid. A zero reading indicates that the problem
a digital display, that is completely portable. This
is in the start switch or the wires for the start switch.
multimeter is built with extra protection against
damage in field applications. The multimeter is
Fasten one multimeter lead to the start switch at the
equipped with 7 functions and 29 ranges. The
terminal connection for the wire from the battery.
6V-7070 Digital Multimeter or the 146-4080
Fasten the other lead to a good ground. A zero
Digital Multimeter has an instant ohms indicator.
reading indicates a broken circuit from the battery.
This indicator permits checking continuity for a fast
Make a check of the circuit breaker and wiring. If
inspection of the circuits. The multimeter can also
there is a voltage reading, the problem is in the start
be used for troubleshooting capacitors that have
switch or in the wires for the start switch.
small values.
Starting motors that operate too slowly can have an
Note: Refer to Special Instruction, SEHS7734 for
overload because of too much friction in the engine
complete information for the use of the 6V-7070
that is being started. Slow operation of the starting
Digital Multimeter. Refer to Operation Manual,
motors can also be caused by a short circuit, loose
NEHS0678 for complete information for the use of
connections and/or dirt in the motors.
the 146-4080 Digital Multimeter.
i01854743
Use the multimeter in the DCV range to find starting
system components which do not function.
Engine Oil Pressure Sensor -
Test
Move the start control switch in order to activate the
starting solenoids. The starting solenoid's operation
can be heard as the pinions of the starting motors
SMCS Code: 1924-081
are engaged with the ring gear on the engine
flywheel.
Refer to the Troubleshooting, SENR9819, "PC-42:
Engine Oil Pressure Sensor Open Or Short Circuit
If a solenoid for a starting motor will not operate,
Test" for information on checking the engine oil
it is possible that the current from the battery did
pressure sensor.
not reach the solenoid. Fasten one lead of the
multimeter to the terminal connection for the battery
cable on the solenoid. Touch the other lead to a
good ground. A zero reading indicates that there
is a broken circuit from the battery. More testing is
necessary when there is a voltage reading on the
multimeter.

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