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Make sure your truck is wired to charge the battery on your trailer, I don't believe those wires and fuses are all hooked up from the factory. Just bought a used 2010 GMC Sierra 2500 HD with trailer package and integrated trailer brake. Still had to hookup the wire under the hood and put in the 40 amp fuse in order to get the battery feed in the 7 wire plug to work. The wire was laying between the big electrical box on the left side and the fender, the wire gets connected to one of the studs in the box. There are 2 studs but different sizes, so it will only fit one of them. Then had to put a 40 amp fuse in the electrical box. It's not a standard blade fuse either, had to go buy one at the auto parts store, so I bought a couple of extra.
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