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3 Design and Function
6. Press the «ENTER» key, one of the three results will be
displayed along with the actual reading measured.
LOW CHARGING VOLTS WHEN TEST AT IDLE
The alternator is not providing
sufficient current to the battery.
Check the belts to ensure the
alternator is rotating with engine running. If the belts
are slipping or broken, replace the 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. If the
belts and connections are in good condition,
replace the alternator.
CHARGING SYSTEM NORMAL WHEN TEST AT IDLE
The system is showing normal
output from the alternator. No
problem is detected.
HIGH CHARGING VOLTS WHEN TEST AT IDLE
The voltage output from the
alternator
to
exceeds the normal limits of a
functioning regulator. Check to ensure there is no
loose connection and the ground connection is
normal. If there is no connection issue, replace the
regulator. Since most alternators have the regulator
built-in, this will require you to replace the alterna-
tor. The normal high limit of a typical automotive
regulator is 14.7 volts +/- 0.05. Check manufacturer
specifications for the correct limit, as it will vary by
vehicle type and manufacturer.
7. Following the charging system at
idle, press «ENTER» for the charg-
ing system with accessory loads.
Turn on the blower to high (heat), highbeam head-
lights, and rear defogger. Do not use cyclical loads
such as air conditioning or windshield wipers.
28
off-load voltage
off-load voltage
xx.xx V Normal
off-load voltage
the
battery
xx.xx V Low
xx.xx V High
Consumer on
Press Enter
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