Alternator terminals

[markweatherill]

I have a 2007 Mitsubishi 'i' car, the 660cc gasoline version.
I fitted a voltmeter and noticed some unexpected behaviour.
When I drove to work this morning, the voltage sat at 14.4V or so. After a while of driving the voltage started to switch between 14.4V and 12.6V and it seems to be based on some kind of system, not just like the alternator was randomly cutting out. On my way home this afternoon, the same thing happened.
I've been driving at night and not noticed the headlights dimming, or any other 'symptoms' of this.

Does this sound like 'intelligent alternator control' or something similar?
The alternator has a connector marked GRLF. What does that stand for?

[markweatherill]

Update: I managed to find a diagram of a connector labelled GSLF in which G = CPU control, S = Sense, L = Lamp and F = Field.
I assume for now that the R in GRLF means Relay...

This morning I experimented with putting my sidelights on and noticed the voltage stayed high; with the lights off it would switch. Interesting, I just wish I could find a factory service manual! This is the first car I've owned that such a thing isn't readily available on the internet.

[some_other_dave]

My 1990 CRX did something like that. Freaked me out right after I put a voltmeter in it full-time. A while after starting, the voltage would suddenly cut down from 14+V to 12.65V. Unless I put an electrical load on (like the lights or the ventilation fan), at which point it went back up to 14+.

-soD