It could be the fuel pump. Sometimes they make a high-pitched whine that might sound like a squeek.
A squeaky alternator is sometimes a sign that the fan belt or something associated with it is squeaking, not the alternator. (Possibly the belt or belt tensioner) So first I'd make sure it's actually the alternator squeaking before I proceeded. You could try some belt dressing on the belt and see if that helps or changes the squeak. If however it is the alternator, that's usually a sign the bearing's gone out and you will need to replace the alternator.
Is Quentin Somerville related to Julia Sommerville?
Which of the following statements is true about storing classified documents?
What is the meter of manang biday?
Ano ang kahulugan ng iskolarling pagpapahayag?