I have a Nissan Maxima and have put two remanufactured alternators in it this week, and after starting the car they got really hot and burnt out within 3 minutes any ideas?
Usually when this type of thing happens it is due to a faulty alternator. I would recommend you buy a difference brand of alternator OR if you have your old one handy get that one rebuilt from a local alternator/starter shop.
One more thing to look for would be any loose or damaged wiring from the alternator to the battery and body ground. Make sure all battery cable connections are clean and tight, and that the belt on the alternator is properly in line with other accessories.