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My 96' F150 has got the factory towing package. I need to wire up a 7 pin plug as my place of employment where I got the truck had a 4 pin put on. I was looking under the hood on the drivers side and saw 2 plugs capped off. 1 was Black and the other was Gray and comes from the Power Distribution Block mounted on the fenderwell. Not sure how many wires going to each. Are they a part of the towing package and if so, what would those plugs plug into?