Westerbeke W-70GA Installationshandbuch PDF herunterladen (Seite 29)

ALTERNATOR

TESTING

e. Now check the voltage between the alternator output

terminal (B+) and ground.

the circuit is good, the

voltage at the alternator should be the same as the

bat-

tery, or

an isolator is in the circuit the alternator volt-

age will be zero.

not, a problem exists in the circuit

between the alternator and the battery. Check all the

connections - look for an opening

the charging

circuit.

TESTING

THE

STARTING

BATTERY

ALTERNATOR

(ENGINE

RUNNING)

ENGINE

,.¢::=-

.......

GROUND

f. 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.

your

alternator is over-

under-charging, have it repaired at

a reliable service shop.

NOTE:

Before removing the alternator

for

repair, use a

voltmeter to ensure that

12 volts

excitation is pre-

sent at the

EXC

terminal

the previous test showed

only battery voltage

the B output terminal.

12 volts are not present

the

EXC

terminal, trace

the wiring looking

for

breaks and poor connections.

Jump

12 V to the Exc. tenninal from a known

12V

source

and

operate the alternator.

the voltage output

13-14 volts, the alternator

o.k. Trace the cause

for

volts not being present

the Exc. terminal.

Alternator

Working

4. Check the voltage

the service battery. This battery

should have a voltage between

and 14 volts when the

engine is running.

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.

CHID

MUlTIMETER

COM

SERVICE

BATTERY

TESTING

THE

SERVICE

BATTERY

(ENGINE

RUNNING)

CAUTION:

When

performing

tests

the

alterna-

tor

charging

circuit

not

use

high

voltage

tester

(i.e.

Megger).

You

can

damage

the

alternator

diodes

ALTERNATOR

INSPECTION

When rebuilding the engine, the alternator should be cleaned

and inspected. The housing can be wiped off with a solvent

and the alternator tenninal studs should be cleaned with a

wire brush. Make certain the studs are tight and clean the

wiring connections that connect to the wiring harness.

Tum the rotor pulley by hand. It should tum smoothly.

Depending on when the alternator was last serviced, the

brushes may need replacing.

the alternator

at all suspect,

send it to a service shop for testing and overhaul.

Engines & Generators

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