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I would say a heavier gauge wire is in order. It doesn't sound like it's heat from the bulb so much as amperage draw through too thin a wire. The Easiest way to tell would be leave one normal bulb in one side, and the bulb in question in the other side. Start the vehicle, and let it run for about 10-15 min with DRL on. Put your hand behind the headlamp assy, and feel the heat. The reflective coating should be absorbing most of the heat, and you shouldn't feel much. You could always use a digital thermometer, if you have one to check the temps. If the heat is in the wire only then you have high amps in an inadequate wire.