DHC BT1000 - Charging System Diagnosis

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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.
ALT. IDLE VOLTS
xx.xx V
NORMAL
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.
ALT. IDLE VOLTS
xx.xx V LOW
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 con
ditioning
or windshield wipers.
TURN ON LOADS
PRESS ENTER
7.
When testing older model diesel engines, the
users need to run up the engine to 2500 rpm for
15 secs.
RUN ENGINE UP
TO
2500RPM 15
SEC
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.
RIPPLE
DETECTED
xx.xx V
NORMAL
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