Installation manual

ManualsBrandsWesterbeke ManualsAutomotive108B

DC

ELECTRICAL

SYSTEM

7.

Now

check

the

voltage

between

the

alternator

output

ter-

minal

(B+)

and

ground.

If

the

circuit

is

good,the

voltage

at

the

alternator

will

be

the

sarne

as

the

battery,

or if

an

isola-

tor

is

in the

circuit

the

alternator

voltage

will

be

zero.

If

neither

of

the

above

is

true,

a

problem

exists

in

the

circuit

between

the

alternator

and

the

battery.

Check

all

the

connections

-look

for

an

opening

in

the

charging

circuit.

STARTING

BATTERY

e9

EB

eeee

.-

ALTERNATOR.

TESTING

THE

STARTING

BATTERY/ALTERNATOR

(ENGINE

RUNNING)

•

MULTIMETER

,I

CI2ID

'~

~

COM

I

~=--'

ENGINE

""

GROUND

8.

Start

the engine

again.

Check the

voltage

between

the

alternator

output

and

ground.

The

voltage

reading

for

a properly

operating

alternator

should

be

between

13.5

and

14.5

volts.

If

your

alternator

is

over-

or

under-charging,

have it

repaired

at

a reliable

service

facility.

NOTE:

Before

removing

the

alternator for

repair,

use

a

voltmeter

to

ensure

that

12

volts

DC

excitation

is

present

at

the

EXC

terminal

if

the

previous

test

showed

only

bat-

tery

voltage

at

the

B output

terminaL

If

12

volts

is

not

present at

the

EKC

terminal,

trace

the

wiring

and wok for

breaks

and poor

connections.

12

VOLT

DC

CONTROL

CIRCUIT

The

engine

has a

12

volt

DC

electrical

control

circuit that

is

shown

on

the·

wiring

diagrams

that

follow.

Refer

to

these

diagrams

when

troubleshooting

or

when

servicing

the

DC

electrical

system.

A

CAUTION:

To

avoid

damage

to

the

battery

charging

circuit,

never

shut

off

the

engine

battery

switch

while

the

engine

is

running.

Shut

off

the

engine

battery

switch,

however,

to

avoId

electrical

sholfs

when

working

on

the

engine's

electrical

circuit.

BATTERY

The

minimum

recommended

capacity

of

the

battery

used

in

the

engine's

12

volt

DC

control circuit

is

600

- 900

Cold.

Cranking

Amps

(CCA).

.

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.

MULTIMETER.

i

COM

e

GROUND

•

ALTERNATOR

•

SERVICE

BATTERY

TESTING

THE

SERVICE

BATTERY

(ENGINE

RUNNING)

A

CAUTION:

Til

avoid

damaging

the

alternator

diodes,

do

not

use

a

high

voltage

tester

(i.e.

a

megger}

when

pedorming

tests

on

the

alternator

charging

circuit.

Battery

Care

Review

the

manufacturer's

recommendations

and

then

establish a systematic

maintenance

schedule

for

your

engine's

starting

batteries

and

house

batteries.

o

Monitor

your voltmeter

for

proper

charging

duling

engine

operation.

o

Check

the

electrolyte

level

and

specific

gravity

with a

hydrometer.

o

Use

only

distilled

water

to

bling

electrolytes

to

a proper

level.

o

Make

certain

that

battery

cable

connections

are

clean

and

tight

to

the

battery

posts

(and

to

your

engine).

o

Keep

your

batteries

clean

and

free

of

corrosion.

A

WARNING:

Sulfuric

acid

in

lead

batteries

can

cause

severe

burns

on

skin

and

damage

clothing.

Wear

protective

gear.

~

WESTERBEKE

Engines.& Generators

25