12V BATTERY TESTER
4. Press «ENTER» to begin charging system test.
PRESS ENTER FOR
CHARGING TEST
5. Press the «ENTER» key, one of the three results will be displayed along with the actual reading measured.
HIGH CHARGING VOLTS WHEN TEST AT IDLE
The voltage output from the alternator to the battery 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 alternator. 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.
CHARGING SYSTEM NORMAL WHEN TEST AT IDLE
The system is showing normal output from the alternator.
No problem is detected.
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 corroded, clean or replace the cable and retest. If the belts and
connections are in good condition, replace the alternator.
6. Press «ENTER» for the charging system with accessory loads.
Turn on the blower to high (heat), high beam headlights, and rear defogger.
Do not use cyclical loads such as air conditioning or windshield wipers.
7. When testing older model diesel engines, the users need to run up the
engine to 2500 rpm for 15 secs.
8. Press «ENTER» to read the ripple from the charging system to the battery.
One of the three testing results will be displayed along with the actual
testing measured.
RIPPLE DETECTED NORMAL
Diodes function well in the alternator / starter.
NO RIPPLE DETECT
Ripple is not detected.
MAKE SURE ALL
LOADS ARE OFF
EN
ALT. IDLE VOLTS
xx.xx V HIGH
ALT. IDLE VOLTS
xx.xx V NORMAL
ALT. IDLE VOLTS
xx.xx V LOW
TURN ON LOADS
PRESS ENTER
RUN ENGINE UP TO
2500RPM 15 SEC
RIPPLE DETECTED
xx.xx V NORMAL
NO RIPPLE DETECT
PRESS ENTER
11