If the voltmeter shows no charge (or if the charge/ignition control lamp is on) and the alternator, battery, belt tension and electrical connectors appear to be in order, have the voltage regulator checked by a dealer or electrician.
Disconnect the negative battery cable.
If your vehicle's radio is equipped with an anti-theft system, make sure you know the correct activation code before disconnecting the battery. Before disconnecting the wire, refer to Section Anti-theft audio system and instrument panel language.
If a message in a different language appears on the instrument panel display after connecting the battery, refer to Section Anti-theft audio system and instrument panel language.
Bosch generator
The voltage regulator is installed outside on the generator housing. To replace the regulator, unscrew the nuts and remove the small terminal cap from the generator cover, then unscrew the nuts and remove the cover.
On Bosch generators, the voltage regulator is easily removed. This type of regulator is integrated with the brush assembly.
Installation is reverse to removal.
Before installing the voltage regulator, check the condition of the collector rings. Using a flashlight, check for grooves and deep wear grooves. Replace generator if necessary.
Motorola Generator
General view of the Motorola generator
1. Remove the generator from the engine (see Section Removal and installation of the generator).
2. Remove the back cover and diode rectifier, unscrew the screws securing the voltage regulator and separate the regulator from the generator housing.
3. Installation is reverse to removal.