Mitsubishi 4DQ5 Service Manual download pdf (Page 88)

(2) Regulator voltage test

(a) Test on a test bench

Use

a fully charged battery. Close the switch,

and gradually increase the alternator speed.

Make sure that the current

below 5 amperes

and the voltage

14.1 to 14.7 volts when the

alternator speed reaches 5000 rpm.

this

requirement

nor met, replace the regulator

assembly.

impossible to reset the regulator

voltage.

(b) Test on a machine

-"'-

Connect a voltmeter

the circuit between

the terminal L and ground. Turn on the

battery switch to make sure that the voltage

0 (zero).

the voltmeter needle defects,

the alternator

defective, or the circuit

misconnected. With the ammeter terminals

short-circuited to prevent the starter current

from flowing to the ammeter, start the engine.

the charging current

below 5 amperes when

the engine

running at about 2000rpm, read the

voltmeter.

it exceeds 5 amperes, charge the battery for a

while, or replace the battery with a fully charged

one. Another method

to connect a 1/4 ohm

(25

resistor

series with the battery to limit

the charging current.

The regulated voltage should be 14.1 to 14.7

volts;

not, replace the regulator assembly.

Battery switch

Ammeter

Volt

meter

Battery

-84-

(3) Alternator inspection after disassembly

(a) Inspection

each diode

Check for continuity between the wire lead and

the heat sink. Any continuity,

noted, means

that the diode

shorted; no continuity means

an open diode.

Checking diodes

(b) Field coil inspection

The field coil

in good condition if the resistance

between the slip rings

approximately 14.3 ohms

at a temperature

20°C (68°F).

Checking field coil

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Mitsubishi 4DQ5 Service Manual Page 88

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