Westerbeke 65B-FOUR Installationshandbuch PDF herunterladen (Seite 40)

DUAL

OUTPUT

ALTERNATORS

TROUBLESHOOTING

NOTE:

Before troubleshooting, make certain that the drive

belts

are

tight and the batteries are in good condition.

Regulator

Testing

The red "battery sensing" wire A connects to the battery, it

must always read battery voltage.

battery voltage

not

present, trace the wire for a bad connection.

The orange

wireS

should read 0 volts with the key off, 12

volts [approximately] with the key on.

the readings are

incorrect, trace the wire for a bad connection.

The blue

wire F supplies current to the alternator fields, its

voltage will vary depending on the battery charge or actual

load/rpm. The readings can vary from 4 to

volts with the

key

on,

0 volts with the key off.

KEY

•

VOLTAGE

REGULATOR

DEFECTIVE

KEY

OFF

•

BATTERY

VOLTAGE

REGULATOR

DEFECTIVE

REGULATOR

TEST

POINTS

AND

PROPER

VOLTAGE

Terminal/Color

Ignition

Off

Ignition

Engine

Running

Brown

volts

-12

volts

14.2

volts

Red

12.6

volts

14.2

volts

Orange

volts

Blue

volts

-11

volts

4 -12

volts

Alt.

Output

12.6

volts

14.2

volts

Alternator

Testing

The

regulator

functioning

properly

and

the batteries

are

in good condition.

Test the voltage at the alternator plug with the engine

off-key on.

The voltage at the alternator terminal F and

the voltage

the plug [blue wire

from the regulator

should read the same.

Hold a screw driver close [1/2"] to the alternator pulley.

voltage

present you should feel the magnetic field.

not, the problem may be the brushes [worn] or the rotor

[open circuit].

3. Start the engine,

fast idle the output terminals should

indicate 14.2 volts [no load]. A reading

12.6 would

indicate the alternator

not performing properly.

Apply a load such

electric bilge pump, the voltage

should maintain at least 13.8 volts.

volts or less

indicates the alternator is faulty.

NOTES:

0 When the engine

first started, it takes a few moments

for

the alternator to "kick in" and take the load. There

a noticeable change

the sound

the engine and the

RPM

gauge will excite. '

D A slight whine is normal when running with a full load

on the alternator.

D When the alternator

producing high amperage, it will

become very hot.

D When replacing the alternator drive belts, always

purchase and replace dual belts

matched pairs.

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