Troubleshooting the electrical system (Audi 80 B3)

The starter does not turn the engine

• The battery is discharged
• The battery wiring is loose
• Starter connections are loose
• Worn starter brushes or dirty commutator

The starter turns the engine slowly

• The battery is discharged
• Starter connections are loose

The battery is not charging

• Electrolyte level too low
• Slipping of the alternator drive belt
• The generator or voltage regulator is faulty
• Short circuit in electrical circuit

The ignition light remains on

• Defective alternator drive belt
• The generator or voltage regulator is faulty

The ignition light does not turn on

• The control lamp has burned out
• Open circuit of the control lamp
• The generator or voltage regulator is faulty

The instrument readings increase with engine speed

• The voltage stabilizer is faulty

Incorrect fuel or temperature gauge data.

• The voltage stabilizer is faulty
• The sensor is faulty
• The electrical wiring is faulty

The lights are not on

• The light bulb burned out
• The fuse has blown
• The electrical wiring is faulty
• Faulty switch

Engine component failure

• Dirty Switch
• Brushes are stuck or worn out
• Defective anchor or field winding
• The electrical wiring is faulty
• Symbols used in electrical wiring diagrams