this is for my kid's subaru. the alternator output is in the vicinity of 12.8v on average. It sometimes dips to 12v even when revved up. On idle, it jumps around between 12.4-12.8v and is not constant. (i have a cigarette lighter voltmeter)

should i go ahead a get a new alternator?

__________________
Ben
1987 190d 2.5Turbo