"Bud" is correct about the Sbelt slipping, check it for wear. Also check the red side of the battery post, it just might be loose, and the torque pulled the engine away just enough to give you a warning.
There is a voltage regulator bolted on the rear of the alternator which contains the brushes, but replacement cost is the same as an alternator - go figure. The brushes themselves are not replaceable.

Please check the wires, there is one that goes to the starter. If that comes loose, all sorts of things light up.

Don't ignore the warning light, it might come back to haunt you. But try the full throttle thing again and see if you can make it happen at will.
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My name is Klaus and I am a V ♂ lv ♂ holic.