The car can hesitate to start because of the air filter, especially if not enough air enters the engine. This lack of air is caused mostly by a clogged or dirty air filter. But the air filter can be blamed mostly. This problem is caused by the air filter more often in winter because of high-temperature changes.
What can cause a bad alternator?
What Causes Alternators to go Bad?
Can an accident cause an alternator to go bad?
It is unlikely that an alternator alone could be damaged in a car crash without terminal damage to the rest of the engine, most likely after a front-end crash. However, a faulty alternator or an alternator that was installed badly could feasibly cause an accident.
How do I know if my car needs new spark plugs?