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Warning! To check the charging system for faults, use the DDS tester and follow the instructions given under the heading "Testing the battery charging system".
The absolute value of voltage measured across the terminals of two of the three yellow cables (the measured value will be the same whichever combination of cable is used) must be within the range indicated in the table below.
(Ambient temperature: 20°C)
Caution! Before testing, disconnect the alternator wiring from the electrical system when the ignition key is set to OFF.
Engine rpm | 2000 | 6000 |
effective V | 27±10 | 78±10 |
Values significantly lower than those indicated above can be due to:
- partially demagnetised rotor;
- short-circuited windings.
In the above cases the whole alternator assembly (rotor and stator) should be renewed.
If checks have a favourable outcome, reconnect the alternator to the regulator with ignition key on OFF. Make sure that no cables are damaged or disconnected.
Removal of the alternator
Disconnect the alternator wires from the electrical system (refer to plate in chapter "Routing of wiring on frame").
Remove the alternator-side crankcase cover, the stator (A) and rotor (B) (Removal of the alternator-side crankcase cover).
Refitting the alternator
Fit the rotor (B), the stator (A) and the alternator-side crankcase cover.
Connect the alternator wiring from the electrical system (refer to plate in chapter "Routing of wiring on frame").