Midtronics B.V. Hoofdveste 6 - 8 Houten NL
www.midtronics.com
EXP-1000 HD
Chapter 5: System Test
Alternator Decisions and Recommendations
Decision
Action
NO PROBLEMS
The system is showing normal output from the alternator. No problem detected.
NO VOLTAGE
The alternator is not providing charging current to the battery.
√
Check the belts to ensure the alternator is rotating with the engine running. Replace broken or slipping
belts and retest.
√
Check all connections to and from the alternator, 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.)
LOW VOLTAGE
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 rotating 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 corroded,
clean or replace the cable and retest.
HIGH VOLTAGE
The voltage output from the alternator to the battery exceeds the normal limits of a functioning regulator.
√
Check to ensure there are no loose connections and that the ground connection is normal. If there are
no connection problems, replace the regulator. (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.)
Diode Decisions and Recommendations
Decision
Action
EXCESSIVE RIPPLE One or more diodes in the alternator aren’t functioning or there’s 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.
PHASE OPEN
The Tester has detected an open phase within the alternator. Replace the alternator.
DIODE OPEN
The Tester has detected a open diode within the alternator. Replace the alternator.
DIODE SHORT
The Tester has detected an shorted diode within the alternator. Replace the alternator.
Содержание EXP-1000 Heavy Duty
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