Group 30: Electrical system Malfunctions
41
Fault condition 2
The voltage input at the MDI is 13V or less for more
than 10 seconds (engine running).
Possible reason
• Too slack alternator belt tension.
• Faulty assembled connectors.
• Poor condition of the cables in the charging sys-
tem.
• Faulty excitation voltage/current to the alternator.
The alternator does not charge.
• Damaged or worn brushes.
• Faulty regulator.
Suitable action
1. Check the alternator belt tension.
2. Check that all connectors at the alternator and at
the battery is correct assembled.
3. Check the conditions of all cables in the charging
system.
4. Check that the alternator recieves correct excita-
tion voltage/current.
5. Check the brushes length and condition.
6. Try another alternator.
Measurements
When the engine is started an excitation voltage/cur-
rent is needed to “wake up” the alternator.
Check altenator excitation voltage
Special tools: Multimeter 9812519,
Adapter cable 88890016, Measurebox 9998699
1. NOTE! Cut the current with the main switch.
2. Disconnect the excitation cable on D+ on the alter-
nator.
3. Connect adapter cable 88890016 with measure-
box 9998699 between the MDI and the engine
connector.
4. Use multimeter 9812519 for voltage measure-
ment.
5. Turn main switch on.
Measurement points Nominal value
16 - 22 U ≈ Battery voltage
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