new alternator not charging
Cadillac Q&AAsk Your Question
1998 Cadillac Catera Question: alternator not charging
Answer #1ZeeTech October 25, 2010, 20:01Master
Well, you need a newer one. Is this a rebuilt AutoZone alternator?
Answer #2patrick mannion from Greg Solow's Engine Room, October 25, 2010, 22:53Master
Turn on the ignition switch to the on but not run position do you see an icon on the instrument panel representing a battery, if you do not see this battery icon the alternator is not seeing power to allow it to charge. Start the engine does the battery icon go out. A more complex but good diagnostic test is checking "voltage drop" on the battery ground and power cables. You can find a video on how to do a voltage drop test on youtube. Put a volt meter across the battery terminals with the engine off, at rest the battery voltage should be 12.6 volts if the battery is fully charged. Now get a friend to start the car while you watch the voltmeter, the voltage reading across the battery should read approximately 14.6 volts if the alternator is charging correctly.