Volkswagen Golf 1997-2004: Main generator malfunctions (Electrical equipment / Power devices)

CAUSE	ELIMINATION METHOD
When the ignition is turned on, the battery charging indicator lamp does not light up
Low battery	Check the voltage and, if necessary, charge the battery
Poor connection or oxidation of battery terminals	Check the connection and, if necessary, clean the battery terminals
Unreliably tightened or oxidized wire on the generator contact	Check and, if necessary, tighten the fastening wire to the generator
Control lamp burnt out	Replace light bulb
Faulty voltage regulator	Check and, if necessary, replace the voltage regulator
Break in the wire between the generator, the ignition switch and the control light	Check the voltage on the circuit, starting from the generator
The alternator brushes do not fit snugly against the slip rings	Check the length of the brushes and their freedom of movement in the holders
The excitation winding of the generator burned out	Check the rotor and diodes, which, if defects are found, must be replaced
The battery charging indicator lamp does not go out when the engine speed increases
Is the V-ribbed belt not tight enough?	Check the condition of the V-ribbed belt and belt tensioner
Faulty idle clutch (only TDI)	Remove the alternator and turn the alternator shaft counterclockwise. If at the same time the movable surface of the belt pulley does not turn, then the idle clutch is faulty
Faulty voltage regulator or alternator	Disconnect the wire from the rear of the generator (D+) and turn on the ignition. If the control lamp still does not light up, then the alternator or voltage regulator is faulty
Worn voltage regulator brushes	Check brush length and replace if necessary
Faulty voltage regulator	Check voltage regulator and replace if necessary
Faulty generator	Check alternator and replace if necessary
Defect in the wire connecting the generator to the voltage regulator	Disconnect the blue wire in the electrical connector T32A of the block 12 of the junction box. If after that the control lamp does not light up, then the D + wire is shorted to ground and it is necessary to replace the wire
Faulty junction box	Disconnect the blue wire from the electrical connector T32A. If after that the control lamp lights up, then the distribution block is faulty
The control lamp of charging of the accumulator burns at the switched off ignition
Diode short circuit	Check and, if necessary, replace the diode

Main generator malfunctions

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