Westerbeke 20B TWO Manual de instalación descargar pdf (Pagina 33)

ALTERNATORS

TESTING/TROUBLESHOOTING

TESTING

THE

ALTERNATOR

CAUTION:

Before

starting

the

engine

make

certain

that

everyone

clear

moving

parts!

Keep

away

from

sheaves

and

belts

during

test

procedures.

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

multimeter set on DC 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

volts, a problem

exists with either the alternator or the charging circuit;

continue with

Steps 3 through

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

is on the correct setting.

Thrn

the ignition switch, but do

not

start

the

engine.

6. Check the battery voltage.

the battery is in good

condition, the reading should be 12 to

volts.

TESTING

THE

OUTPUT

CIRCUIT

,MEASURING

BATTERY

VOLTAGE

(IGNITION

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

connect the negative

probe to ground.

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 or dirty connections or

damaged wiring.

Start

the

engine.

4. Repeat the same measurement, the negative probe to

ground, the positive probe to B with the engine running.

The voltage reading should be between 13.5 and 14.5

volts.

your alternator is over or under-charging, have

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.

If12

volts is not present at exciter terminal R,

inspect the wiring for breaks and poor connections.

Jump 12 volts from a 12 volt source (such

aS.

the

battery) and operate the alternator.

the voltage output

is 13-14 volts,

. then the alternator is OK.

TESTING

THE

OUTPUT

CIRCUIT

ENGINE

RUNNING

Engines & Generators

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Westerbeke 20B TWO Manual de instalación Pagina 33

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