f you are going to be towing a trailer, using an enclosed cargo carrier with lights, or if you want to use an electrical accessory (such as lights, or a winch) you are going to need to add a wiring harness. This video will show how to install a wiring harness on a Chevy Express full size van. It also includes some helpful tips about installing the ground wire, using dielectric grease, and installing a bracket to hold the wires so they are protected from damage.
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