Charging System Test - Midtronics MDX-650P SOH Instruction Manual

MDX-650P SOH

Charging System Test

Once you have completed an in-vehicle test, the display alternates between
the battery test results and the message PRESS
to proceed with the charging test.
Following the on-screen prompts:
1. Rev the engine.
2. Turn on high beams headlights and the blower fan.
3. Rev engine with loads on.
4. Idle engine and turn off loads.
5. The Charging System
Alternator
Decision
Loads-off
DC Voltage
at rev
Decision
NO PROBLEMS
NO OUTPUT
LOW OUTPUT
decision is displayed at the end of the procedure.
CHARGING SYSTEM
DECISION
NO LOAD
14.29V

System is showing normal output from the alternator.
No alternator output detected.
√ 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.)
Alternator not providing sufficient 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.
12
FOR CHARGING TEST. Press
Loads-on
LOADED
DC Voltage
14.25V
6
Interpretation
at rev
continued
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