Westerbeke 65B-FOUR Manual de instalación Pagina 38

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ALTERNATORS
TESTING/TROUBLESHOOTING
BAITERY
TESTING
THE
OUTPUT
CIRCUIT
ENGINE
RUNNING
TO
STARTER
SOLENOID
TESTING
THE
EXCITATION
CIRCUIT
1. Connect the positive ( +) multimeter probe to the
excitation terminal
R
on
the alternator and the negative
(-)
probe to the ground terminal E on the alternator.
2. Thrn the ignition switch to the on position and note
the multimeter reading. The reading should
be
1.3 to
2.5 volts (see illustration).
3.
If
the reading
is
between .75 and 1.1 volts, the
rotor field circuit probably is shorted
or
grounded.
4.
If
the reading
is
between 6.0
and
7.0 volts, the rotor
field circuit probably is open.
5.
If
no reading
is
obtained,
an
open exists in the
alternator-excitation lead
or
in the excitation circuit
of
the regulator. Disconnect the lead from exc. terminal R.
Connect the positive multimeter probe to the excitation
lead and the negative multimeter probe to ground
terminal
E.
If
the multimeter now indicates an
approximate battery voltage, the voltage regulator is
defective and must be replaced.
If
no voltage is
indicated, check the excitation circuit for loose or dirty
connections or damaged wiring.
CHECKING
THE
SERVICE
BATTERY
Check the voltage
of
the service battery. This battery should
have a voltage between
13
and
14
volts when the engine is
running.
If
not, there is a problem in the service battery
charging circuit. Troubleshoot the service battery charging
circuit by checking the wiring and connections, the solenoid,
isolator,
battery switch, and the battery itself.
When the problem has been solved and before the alternator
is back in operation, take the time to tighten and clean the
terminal studs. Also clean the connecting terminals from the
wiring harness.,
ALTERNATOR
REPAIR
If
tests indicate a failed alternator, it will need
to
be
disassembled and repaired. Any good alternator service
shop can do the job.
NOTE:
WESTERBEKE'S Service Manual
has
detailed
instructions for
the
disassembly and repair
of
their
standard
alternators.
BATTERY
CARE
The minimum recommended capacity
of
the battery used in
the engine's
12
volt DC control circuit is 600-900 Cold
Cranking Amps (CCA).
Review the manufacturer's recommendations and then
establish a systematic maintenance schedule for your
engine's starting batteries and house batteries.
Monitor your voltmeter for proper charging during
engine operation.
Check the electrolyte level and specific gravity with a
hydrometer.
Use only distilled water to bring electrolytes
to
a proper
level.
ii
Make certain that battery cable connections are clean and
tight to the battery posts (and to your engine).
l"ffV'lWESTERBEKE
l Engines & Generators
32
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