You can find a radio wiring diagram for a 1993 GMC Sonoma in the vehicle's owner's manual. You can also find it at local auto parts stores.
The GMC heavy duty line of trucks are called GMC Sierras and some of the models come with crew cab options. Auto Trader will direct you to any dealerships near you which are selling GMC Sierras. They are usually widely available.
The year and series would help.
You can find more information about the 2008 GMC Sierra through Kelley Blue Book. You can also read personal reviews of the 2008 GMC Sierra on Edmunds.
Used 1995 GMC Sierras can be found through used car publications such as Auto Trader, by contacting GMC dealerships, or by talking to larger nationwide used car dealers such as CarMax.
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The 1999 GMC stock radio has and auxiliary port on the back of the radio. Plug your sub woofer into the auxiliary port.
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The wiring harness for the radio in a 1991 GMC Pickup is going to be behind the radio. The wiring harness is plugged into the back of the radio. The fuse for the radio is in the fuse box located on the driver's side below the dashboard.
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