A vehicle's stereo system sometimes has a separate amplifier, and when installing a new receiver, you generally need to connect the new stereo's speaker wires to the factory amp's output section. These amp bypass harnesses allow you to use the power from the new car stereo to drive your speakers and not rely on factory power.
These harnesses usually include a color-coded wiring diagram for connecting the harness to your new stereo. Your new stereo will also include a radio wiring diagram in the owner's manual. Refer to the two diagrams to confirm the car stereo wire colors that need to be connected to the adapter harness. The nice thing is that you can make these connections on a workbench, desk, or kitchen table without having to be inside the vehicle.
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