hello there any help is appreciated...the problem i am haveing is really tripin me out , the car is an 03 wrx wagon. here is the problems when i start the car in the morning sometimes it wont start once its started usually by jumping it it starts up but the car has no power at all i think its either the battery or a bad alternator, my question is this would a alternator thats going out cause the car to loose power and cut in and out of boost?
i have tested the battery and it reads 12 v. The alternator was tested while the car is running with a volt meter and its putting out no more than 12.5 volts ant any rpm.
if i need to replace the alternator what should i ask for i have heard that a 2005 wrx sti alternator is a direct replacement and it puts out a little more amperage than the stock unit, if someone can conform what year sti alternator fits that would awesome
thank you in advance DANC