Würth 0772 800 Operating Instructions Manual page 17

RUN ENGINE UP TO
2500 RPM 15SEC
RIPPLE DETECTED
××.××V NORMAL
NO RIPPLE DETECTED
RIPPLE DETECTED
××.××V HIGH
ALT. LOAD VOLTS
××.××V HIGH
ALT. LOAD VOLTS
××.××V LOW
ALT. LOAD VOLT
××.××V NORMAL
TEST OVER TURN
OFF LOADS & ENGINE
When testing older models of diesel engines, the users need to run up the engine
to 2500 rpm for 15 seconds. You will view the adjacent screen:
Press Enter to look for the amount of ripple from the charging system to the bat-
tery. One of two testing results will be displayed along with the actual test result
measured.
Ripple detected normal
Diodes function well in the alternator / starter.
Or
Excess ripple detected
One or more diodes in the alternator are not functioning or there is stator dam-
age. Check to ensure the alternator mounting is sturdy and that the v-belts are in
good shape and function properly. If the mounting and belts are good, replace
the alternator.
Press the Enter key to continue the charging system test with accessory loads.
One of the three results will be displayed along with the actual test result meas-
ured.
Charging system high (when test with accessory loads)
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 of the alternator. Since most alternators have the regulator built-in, this
will require you to replace the alternator.
Charging system low (when test with accessory loads)
The alternator is not providing sufficient electricity for the system's electrical loads
and the charging current for the battery. Check the v-belts to ensure the alternator
is rotating with the engine running. If the belts are slipping or broken, replace the
belts and test again. 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 accessory loads)
The system is showing normal output from the alternator. No problem detected.
Press Enter when charging system test is completed to finish. Turn all accessory
loads and engine off.
Press the Enter key to get to the initial charging system test menu or remove the
test terminals from the battery to switch off the device.
17