Alternator
On-Engine
Inspection
1.
Erroneous handling can cause damage
to
the charging circuit and other troubles so avoid the following:
a.
Never connect the battery in reverse.
b.
Do
not use a megger and other high-voltage testers.
c. When recharging the battery, disconnect the battery cable from the alternator.
d. Never disconnect the lead wire from the alternator terminal B while the engine is running.
e.
Never ground the alternator terminal B
to
which battery voltage is always applied.
f.
Never short circuit
or
ground terminal L
g. When using a steam cleaner, be careful not
to
direct steam directly
to
the alternator.
2. Checking
for
regulated Voltage.
a. Interpose an ammeter between the positive ter-
minal
of
the battery and terminal B
or
the alter-
nator.
b. Ground the alternator terminal
"L"
through a
voltmeter.
c. Note that the voltmeter indicates zero volts when
the key switch is in the
OFF position. The
voltmeter will
indiCate a voltage considerably
lower than battery voltage when the key switch
is in
the
ON
position
(while
the
engine is
stopped).
d. Short-circuit the ammeter and start the engine.
L
R
Checking
for
Regulated Voltage
Ammeter
e.
Read the voltmeter indication (regulated voltage) under the following test conditions: Ammeter
indication is below 5
A;
engine speed is at 1800 rpm and 2500 rpm; and lamps are switched off.
Regulated voltage shows a tendency
to
decrease as alternator temperature increases.
3.
Output inspection.
a.
Disconnect the grounding cable from the battery.
b.
Interpose an ammeter between the battery and alternator terminal "B." Ground the terminal"B" through
a voltmeter.
c. Connect the battery grounding cable.
d. Start the engine.
79
Westerbeke Engines
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