Westerbeke 20B TWO Manual de instalación descargar pdf (Pagina 34)

ALTERNATORS

TESTING/TROUBLESHOOTING

TESTING

THE

EXCITATION

CIRCUIT

1.

Connect

the

positive(+) multimeter probe

to

the

excitation terminal R

on

the

alternator

and

the

negative

(-) lead

to

ground.

2.

Turn the battery switch to the on position

and

note

the multimeter reading. The reading should

be

1.3

to

2.5

volts (see illustration).

TESTING

THE

EXCITATION

CIRCUJT

(IGNITION

3.

If

the reading

is

between .75 and

1.1

volts,

the

rotor

field

circuit probably

is

shorted

or

_grpunded.

4.

If

the

readin~

is

between 6.0

and

7.0

V()lts,

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.

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.

REMOVE

TERMINALR

TESTING

THE

EXCITATI.ON

CIRCUIT

(IGNITION

ON)

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

jn

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

disas-

sembled

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

<:;old

Cranking

Amps

(CCA).

Review

the manufacturer's

recommendations

and

the!}

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

io

a

proper

level.

•

Make

certain that battery cable

connections

are

clean

and

tight

to

the

battery posts (and

to

your

engine).

• Keep your batteries clean

and

free

of

corrosion.

A

CAUTION:

Before

starting

the

engine

make

certain

that

everyone

is

clear

of

moving

parts!

Keep

away

from

sheaves

and

belts

during

test

procedures.

A

CAUTION:

To

avoid

damage

to

the

battery

charging

circuit,

never

shut

off

the

engine

battery

switch

when

the

engine

is

running!

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