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2003 Sonoma SLS ext. cab 4.3L / 4x4
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A fine case of wiring spaghetti to get sorted out, but not too bad. I'd start by getting rid of any of the non (color) matching wires that are spliced into (or extending) the original harness - that only adds to the confusion / challenge of tracing wires. Also delete all of the twisted wire connections and the wire nut joints. Then, you will need likely need to get some new individual (stranded) replacement wires with jacket colors to match the harness wires (& of the proper/ same gauge). One method for reconnecting the wires is using heat shrink marine grade crimp butt connectors (of the appropriate size(s) for the wire gauges), using a good crimping/ wire stripping (a Klein 1010 for instance) tool. Another method is to use heat shrink tubing and soldered joints, if that is a skill set you are proficient with. Make sure the wire ends are clean and corrosion free to insure good conductivity. You can do temporary connections to validate the functionality prior to making up the permanent connections. Just remember, this area has high exposure to road conditions, so it's critical to make sure all of the connections are solid and watertight.

Here's a link to wiring diagrams for the '95. Select the 'exterior lights' section, and it has the tail lights schematics, which will help trace down the wiring.

 
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