Autel Autolink AL539B Manual page 85

Decision
LOW OUTPUT
HIGH OUTPUT
There is a problem with the charging system.
The alternator is not providing enough current
to power the system's electrical loads and
charge the battery. (Figure 8.13)

Check the belts to ensure the alternator is
rotating with the engine running. Replace
broken or slipping belts and retest.

Check the
alternator to the battery. If the connection
is loose or heavily corroded, clean or
replace the cable and retest.
There is a problem with the charging system.
The voltage output from the alternator to the
battery exceeds the normal limits of a
functioning regulator. (Figure 8.14)

Check to ensure there are no loose
connections
connection is normal.

If the connection is OK, check the
regulator.
NOTE: Most alternators have a built-in
regulator requiring you to replace the
alternator. In older vehicles that use external
voltage regulators, you may need to replace
only the voltage regulator.
83
Action
connections
and that the
from the
ground