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I got around to measuring the charge voltage at idle with the headlights on just yesterday :) . I normally do this and record the results whenever I get a new car. That way, if I ever have starting problems, I'll know exactly what the charging voltage should be.

With the engine warm and running, I do get14.55 volts across the battery. This is at idle with the headlights on... Note that as Mike12086 points out in his post above, the ECM controls the charging while you're driving and will cut back or even turn off the charge during acceleration etc in order to save on fuel.
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