Westerbeke 65B-FOUR Manual de instalación descargar pdf (Pagina 37)

ALTERNATORS

TESTING/TROUBLESHOOTING

PRELIMINARY

INSPECTION

Before

staJ.1ing

the actual alternator and voltage regulator,

testing the following checks are recommended.

Make

certain your alternator is securely mounted.

2. Check the drive belt for proper tension. Replace the belt

it is worn or glazed.

3. Check that all terminals, connectors and plugs are clean

and tight. loose

corroded connections cause high

resistance and this could cause overcharging,

undercharging or damage to the charging system. Badly

corroded battery cables could prevent the battery from

reaching a fully charged condition.

4. Check the condition

the battery and charge

necessary. A low or discharged battery may cause false

misleading readings on the in-vessel tests.

NOTE:

isolator with a diode, a solenoid,

a battery

selector switch is usually mounted in the circuit to isolate

the batteries so the starting battery

not discharged

along with the house batteries.

the isolator is charging

the starting battery but not the house battery, the

alternator is

and

the problem is in the battery

charging circuit.

TESTING

THE

ALTERNATOR

CAUTION:

Before

starting

the

engine

make

certain

that

everyone

clear

moving

parts!

Keep

away

from

sheaves

and

belts

during

test

procedures.

Start

the

engine.

2. After the engine has run for a few minutes, measure the

starting battery voltage at the battery terminals using a

multimeter set on

volts.

the voltage is increasing toward 14 volts, the

alternator is working; omit Steps 3 through 8 and go

directly to "Checking the Service Battery".

the voltage remains around 12 volts, a problem

exists with eitl1er ilie alternator or the charging circuit;

continue

witl1

Steps 3 through

MEASURING

BATTERY

VOLTAGE

ENGINE

RUNNING

3. Thrn

off

the

engine. Inspect all wiring and connections.

Ensure that the battery terminals and the engine ground

connections are tight and clean.

a battery selector switch is in the charging circuit,

ensure that it is on the correct setting.

Thrn

the

ignition switch,

but

not

start

the

engine.

6. Check the battery voltage.

the battery

in good

condition, the reading should be 12 to

volts.

Testing

The

Output

Circuit

MEASURING

BATTERY

VOLTAGE

(IGNITION

ENGINE

OFF)

1. Connect the positive probe to the output terminal B and

connect the negative probe to the ground terminal

Eon

the alternator.

2. Wiggle the engine wiring harness while observing the

voltmeter.

The

meter should indicate the approximate

battery voltage, and should not vary.

no reading is

obtained, or

the reading varies, check the alternator

output circuit for loose

dirty connections or

damaged wiring.

Start

the

engine.

4. Repeat the same measurement, the negative probe to E,

the positive probe to B with the engine running. The

voltage reading should

between 13.5 and 14.5 volts.

your

alternator is over

under-charging, have it

repaired at a reliable service shop.

the previous test reads only battery voltage at

terminal B use the meter to measure the DC excitation

terminal.

12 volts is not present at exciter terminal

inspect the wiring for breaks

and

poor

connections.

Jump 12 volts from a

volt source (such as the

battery) and operate the alternator.

voltage output is

13-14 volts, then the alternator is

OK.

Engines

& Generators

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 63 64

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Westerbeke 65B-FOUR Manual de instalación Pagina 37

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