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GM Universal remote extra button?


I have a GMC pickup with a 3 button remote.  I discovered that GM uses the same PCB for all its remotes, so I have a 3 button case surrounding a 4 button PCB.  I want to use the extra button to control an add-on to the truck.  Does anyone know of a way to acquire the RF receiver, what the part number is, etc, and how it would need to be wired in to allow control of external lights on the truck?  I know it would have to be wired into a relay to allow the kind of amperage I am thinking of...but what else am I missing?

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