The 2006 GMC Sierra is a workhorse of a truck and many owners like to upgrade their audio system. For those who want to install larger speakers or replace the factory ones, knowing the speaker wire colors is important.
First things first, the right tools are needed to perform the job. This includes an appropriate size Phillips screwdriver, wire strippers, and a set of Metra crimp connectors. Once all that's ready, the next step is to locate the factory wiring harness in the dash of the vehicle. This can be found on the passenger side near the floorboard.
From there it's a matter of identifying the speaker wires. The wiring scheme is fairly simple; the green and gray wires are positive, while brown and tan are negative. This means that the green wire should be connected to the positive lead from the speaker and the brown wire should be connected to the negative lead. Now that all the wiring is connected and secure, it's time for a good old fashioned sound test. With a good system installed, the 2006 GMC Sierra will have plenty of volume for the tunes.
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