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Up and down? They should run side to side of the truck, not front to back. If you have 4 pins, test the one closest to the drivers side. Red probe on that screw, black probe on the negative terminal on the battery.
Take a picture please. I'm not sure what you mean by up and down. The FICM is mounted on the valve cover, so it sits at a bit of an angle. The pins run from side to side of the truck, in line. The one you need is the one closest to the drivers side.