NANO

628

ELECTRICAL

DIAGNOSTIC INFORMATION & PROCEDURES

BEFORE STARTINGENSURETHE BATTERYCONDITION

CONDITION

POSSIBLE CAUSE

CORRECTION / REFERENCE

ITEM

1) Warning lamp does not

1) If the bulb does not light ground the Warning lamp terminal of the

appear when Ignition switch

alternator

is ‘ON’

2) lf the bulb now lights the caused are:

a) Jammed brushes or brush Free brushes, Replace if

lead adrift.

necessary.

b) Dirty slip rings

Clean the slip rings

c) Rotor open circuit

Check that the ends of the rotor

winding are soldered properly to slip

ring terminals. Re-solder the

windings, if open or replace the rotor

3) lf the bulb does not light even after grounding Warning Lamp

Terminal, the causes are

a) Fused warning lamp bulb.

Check for short circuit, if any in the

wiring harness. After rectifying the

short, replace bulb.

b) Short circuited warning

Replace Holder.

lamp holder

4) If still WL does not appear

Replace regulator

when Ignition switch is on,

the cause is faulty Regulator

2) Warning lamp glows dim 1) High resistance in warning Check and correct

lamp

2) Regulator defect’s.

Replace Regulator

3) Rotor defective

Replace rotor.

3) Warning lamp on. Ammeter

1) Loose belt.

Tighten the belt to the limits as

shows no charge while

indicated in routine maintenance

engine is running.

2) Aux. diode leads ‘A’ open.

Check diode connection and trace

short. Rectify possible or replace

rectifier assembly

3) Shorted rotor

Replace rotor.

4) Stator open/shorted

Replace stator assembly

4) Warning lamp ‘on’ or dim but

1) Faulty rectifier bridge

Replace defective heat sink assy.

ammeter shows charges

(low output)

5) Warning lamp goes off

1) Faulty rectifier bridge

Replace defective heat sink assy

Ammeter shows low output

2) Stator winding short.

Rectify or replace stator assembly

6) Warning lamp (Ammeter)

1) High resistance in the

Check connections and ensure use of

flickers considerably.

Negative line

recommended wire.

2) Slip ring dirty

Clean the slip ring and recheck

7) Overcharging (battery gases)

1) Faulty regulator

Replace regulator

2) Rotor shorted to earth on

Rectify or replace rotor assembly

negative side.