Midtronics MDX-300 Series, Instruction Manual, Page: 10 / 21

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10
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MDX-300 Series
Decision Interpretation
CHARGING
VOLTAGE NONE
(continued)
√
Check all connections to and from the alterna-
tor, especially the connection to the battery. If
the connection is loose or heavily corroded,
clean or replace the cable and retest.
√ If the belts and connections are in good
working condition, replace the alternator. (Older
vehicles use external voltage regulators, which
may require only replacement of the voltage
regulator.)
CHARGING
VOLTAGE LOW
The alternator is not providing enough current to
power the system’s electrical loads and charge the
battery.
√ Check the belts to ensure the alternator is rotat-
ing with the engine running. Replace broken or
slipping belts and retest.
√ Check the connections from the alternator to the
battery. If the connection is loose or heavily cor-
roded, clean or replace the cable and retest.
CHARGING
VOLTAGE HIGH
The voltage output from the alternator to the
battery exceeds the normal limits of a functioning
regulator.
√ Check to ensure there are no loose connec-
tions and that the ground connection is normal.
If there are no connection problems, replace the
regulator. Most alternators have a built-in regu-
lator that requires replacing the alternator. In
older vehicles that use external voltage regula-
tors, you may need to replace only the voltage
regulator.
continued