TM 5-3810-288-12
(b) With the ignition switch on, but the engine NOT
started, check for full battery voltage from the ignition
(IGN) lead of the alternator to ground. Full battery
voltage must be indicated. It will be necessary to unplug
the ignition (IGN) connector and check the male side
with the volt- meter probe. Full battery voltage must be
present at both alternator terminals in order for the ma-
chine to function properly.
Caution: Do not run the alternator with its
output circuit open and the ignition lead en- ergized.
This will create extremely high voltages which will
seriously damage the alternator. Never attempt to
polarize this alternator. Always dis- connect all
alternator leads if welding is to be done on this unit.
and loosen alternator drive belts. Remove all electrical
connections to the alternator. Support the alternator,
remove the adjusting lock screw and remove the
alternator mounting bolts, nuts, and lockwashers.
Remove the alternator.
c.
Starting Motor.
(1) Motor test. Before removing the motor
make the following tests. Check the batteries (para 3-
condition. Inspect all motor wiring for frayed insulation or
other damage. Replace or repair damaged wiring.
Inspect all connections to the starting motor, solenoid,
magnetic switches, ignition switch, start pushbutton, and
battery, including all ground connections. Clean and
tighten any defective connections. If the trouble is not
found, connect a jumper wire around any switch or
solenoid suspected of being defective. If the system
functions properly using this method, replace the
defective item, or report it to proper authority. If none of
the above has located the trouble, check the starting
motor battery terminal, using a voltmeter adjusted for dc
operation, and measure the battery voltage. If voltage is
22 to 24 volts, replace the starting motor.
and remove the starting motor.
Figure 3-37. Engine throttle adjustment
fer to figure 3-52 and remove the solenoid mounting
capscrews shown in part one of figure 3-52 and remove
the starting motor solenoid.
(a) Remove the alternator terminal cover (fig. 3-51)
(4) Magnetic switch replacement. The mag-
to expose the positive (+) terminal and check the voltage
netic switches are treated as part of the starting
from this terminal to a ground connection. Use an
accurate voltmeter set on the 50 volt dc scale for this
check. The ignition switch must be turned ON during this
test. Full battery voltage of 24 volts should be shown. If
no voltage is indicated, an open circuit between the
battery and the alternator is indicated. Check battery
cables,
ignition
switch,
and
wiring.
3-44
