1

Alternator terminal D+ check

With the engine running, check that the voltage is more than 5.5 Volts between terminal D+ and earth

Replace regulator

   Op. 5530A24 ALTERNATOR VOLTAGE REGULATOR - R.R. WITH ALTERNATOR REMOVED

If OK replace the alternator

   Op. 5530A10 ALTERNATOR - R.R.

2

Check the alternator charge with the consumers deactivated

Connect the ammeter pliers EX-02 1000 Ampere to the Examiner diagnostic equipment using the EX01 cable.

Position the ammeter pliers so that the positive battery lead passes inside the sensitive ring and the cable being examined is enclosed by the ring.

Zero the pliers using the CALIBRATION button on the Examiner.

Connect a voltmeter to the battery terminals.

Deactivate all the consumers.

Start the engine and let it reach 2000 rpm.

Check that the voltage is between 14.2 and 14.8 V (at 20°C)

Measure the current and check that it is around 3 A ±10% (at 20°C)

Check whether the figures are very high or whether there is overloading (excessive escape of electrolyte), whether the voltage regulator is defective or whether the alternator field coil is short circuited to earth

Check that the alternator drive belt tension is correct.

If OK

Replace regulator

   Op. 5530A24 ALTERNATOR VOLTAGE REGULATOR - R.R. WITH ALTERNATOR REMOVED

If OK

Replace alternator

   Op. 5530A10 ALTERNATOR - R.R.

3

Check the alternator charge with the consumers activated

Activate the dipped headlamps

Activate the heated rear windscreen

Activate the passenger compartment heater fan at maximum speed

Start the engine and let it reach 2000 rpm

Check that the voltage is between 13 and 14 V (at 20°C)

Measure the current and check that it is around 36 A ±20% (at 20°C)

Check that the alternator drive belt tension is correct.

If OK replace the alternator

   Op. 5530A10 ALTERNATOR - R.R.