TIAGO

ELECTRICAL

8.5 ALTERNATOR

SPECIFICATION

14.5V, 110A for 1.2L NG (Petrol) Engine

14.5V, 120A for 1.05L CRAIL (Diesel) Engine

8.5.1 CHECKS ON ENGINE

START THE ENGINE

Battery charge indicator lamp from

Instruments Cluster does not glow:

Check if

bulb is faulty. Checks fuse continuity. Replace if

necessary.

Connect an ammeter of suitable range in series

with the positive terminal of the battery.

Raise the engine speed to near about 2000 rpm

and switch ‘ON’ the Head Lamp, Parking Lamp,

Heater, Tail Lamp and other electrical loads.

Rated current output should be reached without

voltage dropping to 13 volts. Rated current output

if not reaching, remove the alternator for thorough

checks.

Reduce the engine speed to near about 1500

rpm, and ensure that the ammeter reading falls

around 3 to 5 Amps. Check the voltmeter reading.

It should read between 13.8 to 14.2 volts. If not,

remove the alternator and check the regulator.

Warning lamp continues to glow:

Check the

belt tension. If found slack, adjust the belt

deflection to the specified value. Repeat test.

REMOVAL AND REFITMENT OF ALTERNATOR:

(Refer Engine section)

8.5.2 DIAGNOSTIC INFORMATION AND PROCEDURES FOR ALTERNATOR & BATTERY

CONDITION

POSSIBLE CAUSES

CORRECTION/REFERENCE ITEM

Battery

getting

discharged

Leakage current is high due to extra

accessories fitted on the vehicle.

Measure the leakage current. If it is

greater than 15mA, disconnect the idle

power consuming accessories.

Battery not getting

charged

1. Alternator belt loose

2. Battery terminals loose

3. Battery terminals corroded

4. Alternator voltage regulator setting

Wrong

5. Idle speed of engine too low

Tighten belt

Tighten the terminals

Clean the terminals

Check alternator output voltage. It

should be between 13.5 V and 14.5 V.

Otherwise replace the regulator with a

genuine spare.

Adjust engine idle speed