The black and red wires connect to the original bulb socket inside the headlight, they provide the power for the balast.
Unfortunately i can not remember which is the positive and negative on the headlight wiring harness, i think the brown wire is the positive but i would check with a multimeter before.
Do these have all the necessary leads to stop the bulb warning system from going off ??
not 100% sure when i fit them at the weekend ill let u know.
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