Midtronics DCA-8000

Midtronics Inc. 7000 Monroe Street Willowbrook, IL 60527
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Appendix C: Test Results Decision Tables DCA-8000
Alternator Test Results
Decision Action
CHARGING
NORMAL
The output from the alternator is normal.
NO OUTPUT
No output detected. Check belts to ensure alternator is rotating when engine is
running.
√ Check all alternator connections including to the battery. Clean or replace if
necessary and retest.
√ If the belts and connections are in good working condition, replace alternator
or external voltage regulator.
LOW OUTPUT
Alternator not providing enough current to power electrical loads and charge the
battery.
√ Check belts to ensure the alternator is rotating with the engine running.
√ Check alternator connections to and from the battery. If loose or heavily
corroded, clean or replace the cable and retest.
HIGH OUTPUT
Alternator voltage to the battery exceeds normal limits of a functioning regulator.
√ Check for loose and normal ground connections. If no connection problems
are found, replace the regulator.
The normal high limit of a typical automotive regulator is 14.5 volts +/–0.5. Refer
to the manufacturer specications for the correct limit, which may vary by vehicle
type.
Diode Test Results
Decision Action
NORMAL
RIPPLE
The output from the alternator is normal.
EXCESSIVE
RIPPLE
One or more diodes in the alternator are not functioning or there is stator damage,
which is shown by an excessive amount of AC ripple current supplied to the
battery.
√ Make sure the alternator mounting is sturdy and that the belts are in good
shape and functioning properly. If the mounting and belts are good, replace
the alternator.
OPEN PHASE
Replace the alternator.
OPEN DIODE
SHORTED
DIODE