You may have another Alternator issue so get the charge rate checked. Then, look for a leakage issue like the glove box lamp staying on, or the lamp in the trunk or boot staying on. I have even seen the lamps in the footwells stay on and drain a battery overnight.
An easy test is to use a test lamp. Make sure all the doors are closed and everything is turned off (tail lamps etc). Disconnect the battery negative and connect the test lamp between the battery post and the cable clamp. If the lamp lights and stays lit, you have a leakage. Begin by disconnecting the courtesy lamps or removing the bulbs. When the test lamp goes out, theres ya leakage. If you have a charging system connected to the vehicle which charges a second battery, like one in a caravan, check those circuits too..
And even though the Alternator is new, it may still be the cause of the problem.. So check it out as well..
Testimonial: "Thank You, I didn't realize that a leakage can happen if the light is out . I also was wondering if the cigarette lighter was a factor ?"
If the lighter element is shorted, it will blow the fuse, or if something else is plugged into the lighter socket which has a problem may also cause the fuse to blow.
The internal regulator in the alternator is electronic and as such can fail at any time but if the alternator is new, this should be covered under the warranty. Otherwise, do the leakage test and see what happens. You can also unplug the smaller wiring connections to the alt whilst doing this test, if the light then goes out, its a faulty regulator..
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