Alternator symptom question.

[Sloan]

I just replaced the alternator on my FJ 60 and when it is running with the choke out it reads 14 volts. When the choke is in and it is at idle, when I turn on the turn signal the needle on the gauge fluctuates with the turn indicator going on and off. The reason I ask is that when I replaced the alternator in my 69 Charger last year, it now does the same thing. Any thoughts?

 

[HenryJ]

If a few rpm is all you need to maintain output, a slightly smaller alternator pulley will do the job. 2 mm smaller made a big difference on one of mine.