In most cases an alternator will last well over 100,000 miles
The alternator is going bad, may need to be replaced soon
The ground cable, on the battery may need to be tightened or cleaned. The alternator voltage regulator may need to be replaced.
You need to replaced the starter or the alternator.
The drive belt on the alternator of a 94 Toyota Corolla won't turn if the bearing has seized. The alternator will need to be replaced.
The alternator in a car may need to be replaced if some simple signs are noticed. A noise may originate from under the hood, or lights in or on the car may dim or flash.
I have an '01 diesel Excursion. I go through batteries about 1x per year, but only replaced my alternator 1x in 6 years.
The regulator is in the engine computer not the alternator.
The filters are what needs to be replaced most often on the air conditioning units.
There are a few reasons why your alternator might keep going bad such as rusty latches under the car. You may also have leaks, dents, or parts that need to be replaced on the vehicle that are effecting your alternator.
If an alternator light keeps coming off and on, this may indicate that the voltage output of the vehicle is going up and down intermittently. This may mean the alternator may need to be replaced soon.
It depends on the use, but yes, they have to be replaced periodically.
The computer only resets when the battery is removed. The alternator just charges the battery, so if the battery is left connected when the alternator is replaced, the computer should not reset.