ALTERNATOR AND MOUNTING BRACKET REPLACEMENT/REPAIR (CONT).
If testing is to be accomplished,
alternator follow-on tasks must be
Turn all lights and accessories on, then pull
shutoff handle while cranking engine 10-15
seconds (para 2-8). This discharges the battery.
Release fuel shutoff handle and turn off lights
Open right side access cover and attach
voltmeter and ammeter as shown.
If voltmeter reading exceeds 30.3
volts, shut engine down immediately
or damage to equipment may result.
Refer to table 4-6.
Start engine (para 2-8), and accelerate to 1500-
2000 RPM. Normal voltage is 24 V, and normal
amperage is 28.2 to 28.8 amps. Take readings
and refer to table 4-6.
Remove voltmeter and ammeter and close right
side engine access cover.
Connect battery cables (para 4-73)
Install alternator belt (para 4-56)
END OF TASK
Table 4-6. Alternator Testing.
Charging system OK. Battery not
yet fully charged. Wait for charging
system to bring battery to full
charge: amps should fall and volts
Watch until amps fall or volts
exceed Normal Range. If amps fall
and volts remain normal, charging
system OK If volts exceed normal,
regulator should be replaced.
Regulator should be replaced.
Make sure voltmeter leads are
attached to alternator, not battery. If
Charging system OK
If battery checks OK, regulator
should be replaced.