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Alternator
The charging rate of the alternator should be checked
when an alternator is charging the battery too much
or not charging the battery enough.
Alternator output should be 28 ± 1 volt on a 24 volt
system and 14 ± 0.5 volt on a 12 volt system. No
adjustment can be made in order to change the rate
of charge on the alternator regulators. If the rate of
charge is not correct, a replacement of the regulator
is necessary. For individual alternator output, refer to
Specifications, “Alternator”.
1. Check that the nut on the “B+” terminal is secure
and that the wire has a good connection to the “B
+” terminal.
2. Start the engine. Set the throttle to at least 75% of
full throttle. Turn on all accessories. Allow the
engine to operate for at least three minutes.
3. Measure the voltage between the “B+” terminal
and the ground for the alternator.
4. Measure the voltage across the battery. Put the red
lead on the positive battery terminal, and the black
lead on the negative battery terminal. Step 4
should be completed as quickly as possible after
step 3.
Result
The voltage in step 3 is not more that 1 V for a 12
V system or 2 V for a 24 V system and higher than
the voltage in step 4. The test is complete and the
related wiring is correct at this time. Replace the
alternator.
The voltage in step 3 is more than 1 V for a 12 volt
system or 2 V for a 24 volt system and higher than
the voltage in step 4. There is a high circuit
resistance such as corrosion, loose connections or
damaged wiring. Continue to step 5.
5. Check the voltage between the machine frame and
the “B+” terminal of the alternator. Record the
voltage.
6. Check the voltage between the machine frame and
the positive battery post. Step 6 should be
completed as quickly as possible after step 5.
Result
The voltage difference between step 5 and step 6
does not exceed 0.5 V on 12 V systems and 1 V
for 24 V systems. The charging circuit is good. Go
to step 7.
The voltage difference between step 5 and step 6
exceeds 0.5 V on 12 V systems and 1 V for 24 V
systems. There is a high resistance in the circuit.
The following items may cause the high
resistance.
• Loose cables
• Corroded cables
• A fault with the circuit breaker
Correct the fault and retest the system.
7. Check the voltage between the negative battery
post and the alternator case ground.
Result
The voltage does not exceed 0.5 V on 12 V
systems and 1 V on 24 V systems. There is an
internal problem with the alternator.
The voltage exceeds 0.5 V on 12 V systems and 1
V on 24 V systems. There is a high resistance in
the circuit. The following items may cause the high
resistance.
• Loose cables
• Corroded cables
• A fault with the circuit breaker
Correct the fault and retest the system.
i04371153
V-Belt - Test
NOTICE
Ensure that the engine is stopped before any servic-
ing or repair is performed.
To maximize the engine performance, inspect the
poly v-belt for wear and for cracking. Replace the poly
v-belt if the belt is worn or damaged.
• Check the poly v-belt for cracks, splits, glazing,
grease, displacement of the cord and evidence of
fluid contamination.
The poly v-belt must be replaced if the following
conditions are present.
• The poly v-belt has a crack in more than one rib.
• More than one section of the poly v-belt is
displaced in one rib of a maximum length of
50.8 mm (2 inch).
To replace the poly v-belt, refer to Operation and
Maintenance Manual, “Alternator and Fan Belts -
Replace”.
84 UENR0623
Electrical System
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