
Fault diagnosis
Cause
Remedy
Warning light does not light up when ignition is switched on.
Instruments inoperative
1. Blown fuse 2 in fuse box
2. Broken supply circuit in instru-
ment cluster:
- no voltage between terminal «Å»
of main fusebox and instrument
cluster;
- no voltage between ignition relay
and fusebox unit
3. Ignition switch or ignition relay
faulty:
- faulty contact part or ignition
relay;
- no voltage between ignition
switch and ignition relay;
- break or no contact in the igni-
tion relay earth wire
Warning light does not light up when ignition is switched on and
does not stay on during engine operation.
Instruments operate. Battery is discharged.
1. Blown warning light bulb or
loose holder-to-PCB contact
2. Broken circuit between instru-
ment cluster and alternator termi-
nal 61
3. Brushes worn or binding, slip
ring oxidized
4. Voltage regulator damaged
(break between «ò» terminal
and earth)
5. Lead from voltage regulator
«Ç» terminal disconnected
6. Short-circuit in positive diodes
7. Field winding leads discon-
nected from slip rings
8. No contact between voltage
regulator terminals «Ç» and «ò»
and brush terminals (for pre-1996
alternators)
Warning light is bright or half bright with engine running. Battery
is non-charged
1. Alternator drivebelt slipping
2. Voltage regulator damaged
3. Damaged diodes
4. Field winding diodes damaged
5. Stator winding broken, shorted
or earthed
Warning light is on with engine running. Battery is overcharged
Voltage regulator damaged (short-
circuit between terminal «ò» and
earth)
Alternator is noisy
1. Loose alternator pulley nut
2. Alternator bearings damaged
3. Stator winding shorted internally
or to housing (alternator howl)
4. Short-circuit in diode plate
5. Brush squeak
WARNING. Always earth the battery negative post to the
bodyshell and connect the positive post to the alternator clip
30. If battery connections are erroneously reversed, the
alternator diodes will be damaged by resulting high voltage.
Never operate the alternator with the battery disconnect-
ed since this causes overvoltage peaks at the alternator ter-
minal 30 and can damage the voltage regulator or other elec-
tronic devices of the vehicle electrical system.
Never test the alternator for «spark» by earthing the
alternator terminal 30 even for a short time. The diodes can
be damaged by considerable current flow. Check the alter-
nator operation using an ammeter or a voltmeter.
Never check the alternator diodes by applying voltage
over 12 volts or using a megohmmeter, as its voltage is very
high and can damage the diodes (by short-circuit).
Never check the vehicle wiring by a megohmmeter or a
lamp powered in excess of 12 volts. If the check is really
necessary, disconnect the leads from the alternator first.
Always use the test bench and disconnect the winding
from the diodes when performing the high voltage check of
alternator stator winding insulation resistance.
When welding the body units or components, remember
to disconnect first the leads from all battery and alternator
connectors.
Alternator - testing
Using tester
A tester helps determine whether the alternator is faulty or
meets the specification. The carbon brushes of the unit tested
should slide smoothly on the slip rings, which should always be
clean.
141
1. Renew fuse
2. Carry out the following:
- check wire «é» and its connec-
tions between fuse boxes and
instrument cluster;
- check wire «Éó» and its connec-
tions between ignition relay and
fusebox
3. Carry out the following:
- check and renew faulty contact
part of ignition switch or ignition
relay;
- check wire «É» and its connec-
tions between ignition switch and
ignition relay;
- check wire «ó» and its connec-
tions between ignition relay and
earth
1. Renew failed bulb, bend holder
contacts or replace bulb holder
2. Check wire «äÅ» and its connec-
tions between alternator and instru-
ment cluster
3. Renew brush holder with brush-
es, clean slip rings with fuel-moist-
ened cloth
4. Renew voltage regulator
5. Reconnect wire
6. Renew diode plate
7. Solder pins or renew alternator
rotor
8. Clean voltage regulator terminals
«Ç», «ò» and brush output; bend
voltage regulator pins
1. Adjust belt tension
2. Renew voltage regulator
3. Renew diode plate
4. Renew diodes or diode plate
5. Replace alternator stator
Renew voltage regulator
1. Tighten nut
2. Renew rear bearing or front
cover with bearing
3. Renew stator
4. Renew diode plate
5. Clean brushes and slip rings with
cotton cloth moistened in petrol
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