Although a wire might have a nominal current weighting of X Amps, you need to give some thought to voltage drop.
E.g 16 AWG wire is rated at 22 Amps (ish), so it should be fine for the headlight circuit (110 watts, so 10 Amps for arguments sake). When you consider you've probably got 12 ft of wire, that results in a voltage drop of approx 1V.... add that to the voltage drop from the rear to the distribution point in the front, and you have yellow headlights.
If you've driven a Mk2 golf, corrado, or Impreza you'll know how annoying underspecced wires, and the resulting voltage drop can be - candles in beer bottles.....
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