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2002 GMC Sierra trailer wiring for electric brakes

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Hello - the Subject is a


2002 GMC sierra 4.3 short bed reg cab 2wd



harness in back is for light duty trailering - 6 wires


I need to have set up for 7 wires heavy duty trailering


I have installed brake controller and done the under dash harness wiring


What do I need to do under the hood? install fuse? wiring? What are the 6 wires out back? do I need to bring other wires and from where?


Thanks for the help

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thanks but need more details than that.


What is too be connected under the hood? and where is the wire that needs to be connected to the fuse box?

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