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metra 70-6510.. amplifier bypass harness.. simple.. takes output plug from factory amp and allows you to plug this in and use the new h/u to power all speakers in vehicle... roughly 20-30 dollars on ebay.
This is why when i did mine, I just ran new 14 ga wire to my doors and left all the OEM wiring alone. I did tap power and ground from the OEM harness but that was all and all that was needed.