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I guess it's a tie since you're both wrong, lol. J/K

Usually the point of a wiring harness is that the factory wires going to your lamps are marginal in size. When they are running HIDs typically draw less amperage than standard bulbs, however the ballasts have a fairly high amp draw at startup, like an electric motor. If your wiring is too small then you will get voltage drop when the ballast is trying to light that can cause them to not light properly and/or damage the ballasts over time.

Also depending on the vehicle, if you're wiring was too small and you were running HIDs with a very high amperage requirement, you could draw more power than the wire is rated for causing overheating and voltage drop or in extreme case an electrical fire.
 
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