Its a good possibility Your diodes are burnt out, its time to replace your alternator, i had a similar problem on a 95 lumina with a 3.1l motor
I have a 92 Pontiac and also had similar situation. Sometimes the voltmeter would go to 14volts and other times it would sit at 12volts. When I tested output from alternator to the battery with voltmeter, I did not get a good reading. Upon removal of the alternator to get it replaced, I noticed that the smaller (red) cable that goes from the alternator to the battery was loose in the connector itself. I cut the cable at the connector, stripped the cable some and crimped on a new connector. Reattached to alternator and put alternator back into vehicle. All has been fine since. Hope this may fix your problem.
The usual cause of a blown alternator is overload. The alternator will also blow if the battery is connected backwards, even for an instant, such as during jumping. Sometimes, overload is caused by attempting to jump start another car while revving the engine of the first car. The alternator is not designed to carry the current of a starter. Depending on the alternator, protection might be built in, but don't count on it. Rev the engine only to help charge the other battery, and then let the engine idle while starting the other.
Sometimes when parts are new, they have coatings and etc. that will smell when parts are warm. For example, alternator windings are coated with a electrical varnish. When the alternator is charging, it creates heat. This causes the paint to smell and odors such as a burning smell can be common for a couple of days.
First, disconnect the battery cables, Second, you have to drain some or all the coolant so you can remove the upper radiator hose, Third, disconnect the alternator cables, Fourth, loosen the bolt attaching the alternator so you can loosen the alternator belt, Finally, remove the bolt and angle the alternator to remove it. You might need to hammer the alternator from underneath, sometimes they are really tight. 'Hope this helps.
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