A a general rule, the wrong size fuse won't cause your problem, it might be coincidental that the problem popped up after replacing the fuse.
Get a multimeter and check the alternator voltage when the car is idling with no loads (everything off) and loaded (headlights on high beam and blower fan on high). If you have a drop in voltage or if you are reading less than 13 volts at the battery, you have an alternator problem. Good luck.
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