About 14.2 V is what I've measured on many alternators in good working order. Had one once that was putting out only about 13.8, and found that it's brushes were just about gone. Oily brushes might do that to.
I've got that alt light gremlin in my AU. Comes on now and then for a while then goes off when ever it wants. Almost bit the bullet and bought a new alt a few times, just to find out if that's really the problem. But its working just fine (14.2 V even when alt light is on), and doesn't overcharge the battery. At first I could thump the dash and the light would go out, then after a while it took 2 thumps, then 3 thumps, now thumping doesn't work anymore. But it does tell me that the problem is in the cluster, bad contact somewhere maybe. Can't get the cluster out though, it's glued in really hard and won't budge, tried pushing from the back etc, no luck.
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