Expert Answers about GMC Sonoma

• Hardware Needed to Install CE Smith Bunk Bracket
• The CE Smith Light Duty, Vertical Bunk Bracket # CE10600G doesn't actually use nuts and bolts to install, it just uses U-bolts. The U-bolts, however, do include the nuts and washers needed to use the brackets. You will need to know the length and width of the U-bolts you need though, such as the 3" Long x 4-1/8" Wide # CE15254A or smaller 3-9/16" Long x 1-9/16" Wide # CE15281GA. I have added a link to our entire selection of U-bolts for you to check out as well.
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• Installing Hopkins Plug-In Simple Vehicle Wiring Harness on 2004 GMC Sonoma
• The Hopkins Plug-In Simple Vehicle Wiring Harness # HM41135 referenced in your question is confirmed to fit your 2004 GMC Sonoma. This will install by connecting the built-in port that is located behind the rear bumper on the driver's side of your vehicle. Once that connection is made, you will have a 4-Way connector to connect with and power a trailer's signal lights. I have attached the written installation instructions that you can also use for reference.
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• Finding Cold Side of Brake Light Switch on 2004 GMC Sonoma
• According to my research the cold side of the brake light switch behind the brake pedal on your 2004 GMC Sonoma is likely white in color. I still strongly recommend that you test the wires with a circuit tester like # PTW2993 to ensure you find the one that only gets power with the brake pedal depressed and no power with any other function. You can simply start by testing the white wire to hopefully shorten up this process. The cold side of the brake light switch will connect to the...
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