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Look at the plug cover on his truck, & there is a pin marked +, that's the one which bring power to the light inside the trailer. On the chevy the power need to come at the same pin, test it with a test light. May be it's not hook up on the chevy or a fuse is blowned. Your owner manual should tell you where is the fuse & which one. Chevy don't give much infos for trailer wiring.
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