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It would help if told us the year and which radio you have.
 

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Then it already has an amp and a sub. The sub should be on top of your spare tire.
 

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You can take a drill battery pack run a wire from the negative and positive point and touch the harness pins to find your speakers and you can use test light to find your constant use test light first to rule out your constant wires on the factory harness
 
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