I would venture a guess with what little information you've provided (make, model, year...) that your vehicle had a factory installed amplifier. Take the blue wire from the new head unit and attach it to the power lead for the factory amplifier. Fords usually locate the factory amp under the passenger's seat. Chrysler infinity systems (Jeep) under the back seat etc... I hope I've helped. If so please rate my answer and leave a comment. If not, please re-post.
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