Volkswagen Golf/Jetta 2 manual

Alternator - brush and voltage regulator renewal
Starting and charging systems / Alternator - brush and voltage regulator renewal


Bosch
1 Disconnect the battery negative lead.

2 Wipe clean the exterior surfaces of the alternator around the voltage regulator.

3 Remove the two screws and withdraw the voltage regulator and brush assembly from the rear of the alternator (see illustration).

8.3 Removing voltage regulator and brush assembly
8.3 Removing voltage regulator and brush assembly

4 Check that the length of the carbon brushes is not less than the minimum amount specified (see illustration).

8.4 Checking alternator brush length
8.4 Checking alternator brush length

5 If the brushes are serviceable, clean them with a solvent-moistened cloth.

6 Check that brush spring pressure is equal for both brushes and holds the brushes securely against the slip rings. If in doubt about the condition of the brushes and springs, compare them with new items.

7 If the brushes are over worn, unsolder the brush leads and remove the brushes. Clean the housing, insert the new brushes and solder the new leads into position.

8 Clean the slip rings with a solventmoistened cloth, then check for signs of scoring, burning or severe pitting. If worn or damaged, the slip rings should be attended to by an auto-electrician.

9 Reassembly is a reversal of the dismantling procedure.

Motorola
10 This procedure is similar to that described for the Bosch alternator. Identify the regulator wires for position before disconnecting them (see illustration).

8.10 Voltage regulator/brush unit removal
8.10 Voltage regulator/brush unit removal


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