Dc Electrical System - Westerbeke 8.0KW-60HZ Operator's Manual

DC ELECTRICAL SYSTEM
ALTERNATOR
The charging system consists of a DC belt driven alternator
with a voltage regulator, an engine DC wiling harness, a
mounted DC circuit breaker and a battery with connecting
cables. Because of the use of integrated circuits (lC's), the
electronic voltage regulator is very compact and is mounted
internally or on the back of the alternator.
1.
Start the engine.
2. After the engine has run for a few minutes, measure the
starting battery voltage at the battery terminals using a
multi meter set on DC volts.
a. If the voltage is increasing toward 14 volts, the alterna-
tor is working; omit Steps 3 through 8 and go directly
to "Checking the Service Battery?' on the next page.
b.lf the voltage remains around 12 volts, a problem
exists with either the alternator or the charging circuit;
continue with Steps 3 through 8.
CHID
#14 BROWN
TO TB2-4
TO STARTER
SOLENOID
MULTIMETER
---''''''0
COM
#14 VIOLET
TO
FUEL SOLENOID,
LIFT PUMP AND
DISTRIBUTOR
51 AMP ALTERNATOR
SEE WIRING DIAGRAM
FOR WIRE CONNECTIONS.
ALTERNATOR TROUBLESHOOTING
A
WARNING:
A failed alternator can become very
hot. 00 not touch until the alternator has cooled down.
Use this troubleshooting section to determine if a problem
exists with the charging circuit or with the alternator. If it is
determined that the alternator or voltage regulator is faulty,
have a qualified technician check it.
The allernator charging circuit charges the starting battery
and the service battery. An isolator with a diode, a solenoid
or a battery selector switch is usually mounted in the circuit
to isolate the batteries so the starting battery is not discharged
along with the service battery. If the alternator is charging the
starting battery but not the service battery, the problem is in
the service battery's charging circuit and not with the alterna-
tor.
Testing the Alternator
A
CAUTION:
Before starting the engine make certain
that everyone is clear of moving partsl Keep away from
sheaves and belts during test procedures.
A
WARNING:
When testing with
a
multi meter:
DC and AC circuits are often mixed together in marine
applications. Always disconnect
a
shore power cord,
isolate DC and AC converters, and shut down the engine
before performing DC testing. No AC tests should be
made without a proper knowledge of AC circuits.
TESTING THE STARTING
BATTERY/ALTERNATOR
(ENGINE RUNNING)
3. Tum off the engine. Inspect all wiring and connections.
Ensure that the battery terminals and the engine ground
connections are tight and clean.
A
CAUTION:
To avoid damage to the battery
charging circuit, never shut off the engine battery
switch when the engine is runningl
4. If a battery selector switch is in the charging circuit,
ensure that it is on the correct setting.
5. Tum on the ignition switch, but do not start the engine.
6. Check the battery voltage. If the battery is in good condi-
tion, the reading ShOll Id be 12 to 13 volts.
TESTING THE
ALTERNATOR VOLTAGE
(gID
0 . . . . . . _-·
MULTIMETER
COM
+
(IGNITION ON - ENGINE OFF) ~~~~~
Engines & Generators
- ·GROUND
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