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Do you have a multi-meter? If so check the voltage at the battery terminals while it's running...if it matches your gauge the voltage regulator is probably bad. I know when i first start my car it reads almost 16, like 15.5v, but settle down to 14.4 after warm up
I cant remember if it was cold out that morning, but that night i realized my right head light was out.
Hmmm, I would definitely check the voltage at the terminals with a multimeter.
Like someone said earlier, it could be a regulator going bad. Overvoltage will cause bulbs (like your headlight) to go out, and sometimes explode.