Forch BT-D 6-12 V Manual Del Usuario página 21

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When testing older model diesel engines, the users need to run up the engine to 2500
rpm for 15 seconds. You will view the screen as follows:
■ Press «ENTER» to look for the amount of ripple from the charging system to the battery.
One of two testing results will be displayed along with the actual testing measured.
RIPPLE DETECTED NORMAL
Diodes function well in the alternator / stator.
RIPPLE DETECTED
EXCESS RIPPLE DETECTED
One or more diodes in the alternator are not functioning or there is stator damage. Check to
ensure the alternator mounting is sturdy and that the belts are in good shape and function-
ing properly. If the mounting and belts are good, replace the alternator.
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Press the «ENTER» key to continue the charging system with accessory loads. One of
the three results will be displayed along with the actual testing measured.
CHARGING SYSTEM HIGH WHEN TEST WITH ACC.
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 issues, replace the regulator. Since most alternators have the
regulator built-in, this will require you to replace the alternator.
CHARGING SYSTEM LOW WHEN TEST WITH ACC.
The alternator is not providing sufficient current for the system's electrical loads and the
charging current for the battery. Check the belts to ensure the alternator is rotating with the
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 working condition, replace the alternator.
CHARGING SYSTEM NORMAL WHEN TEST WITH ACC.
The system is showing normal output from the alternator. No problem detected.
SETTINGS AND INFORMATION RETRIEVAL
LANGUAGE SELECT
■ Hook the tester up to a battery.
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The tester defaults to the BATTERY TEST display. Press the directional keys to get to the
LANGUAGE SELECT display.
■ Press «ENTER» and the display will show the language options. Press the directional
keys to select the language you want the tester to display.
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Press ENTER and the display returns to BATTERY TEST.
CUSTOMIZE
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Hook the tester up to a battery.
OR NO RIPPLE DETECT