Brake Controller.
 

On my 92 f150 I have a small square plug under the center of my dash that would be used for a brake controller.
When I buy a new controller, will it be plug and play or will I need to add some more wires to make it work?

I ask because my 7 prong rv plug has nothing to tap into in the rear of the truck, I have the standard wires plugged in for brake,turn, lights hooked up, but nothing for 12+ or power for trailer brakes.
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You can buy an adapter that plugs in to it. Tekonsha 3035s will work. At the rear of the truck should be a pigtail close to the connectors at the rear of the frame with 3 wires in it, a large blue, and orange. The blue should go to the connector under your dash, splice in and run to the 7 way plug. The orange is 12v batt for charge wire

I used the adapter plug for the rv plug for the turns,brake,lights and hooked it to the factory plug at the end of the bed.
I didn't notice a plug with the blue,orange,white? wires, would you have a pic handy of its location and what it looks like?

Sorry no pic, cut it off my truck to wire to RV plug. If it's not at end of frame on passenger side it may have a connector on drivers side inner front fender that would run to back of truck. Use a voltmeter to verify, that's how I found the correct plug.

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This is one other plug I have at the rear of the truck, it has two wires, one black and one brown, is that related to the trailer brakes?