Welcome to the forum. If you have a digital voltmeter, take a reading across the battery posts, everything turned off. The generic spec for a full charge is 12.6 volts. Start the vehicle take a second reading across the battery posts, the second reading should be higher than the first, if the alternator is charging. Engine running, you can also take a reading at the alternator bat terminal, just don't get the leads caught in belt or pulleys.
If not excite voltage, the alternator won't charge. If there is a problem with the wiring circuit between the alternator bat terminal and battery, possible, no charge.
Sunday, January 31st, 2010 AT 3:04 PM