To adjust and aim the headlights on a Ford F-150 (1997-2004) using the Lisle Tool 14540, you can follow these steps:

1. Park your F-150 on a flat surface facing a wall or garage door.

2. Measure and mark the centerline of both headlights on the wall. This will help you determine the proper alignment later on.

3. Locate the headlight adjustment screws. In the 1997-2004 Ford F-150 models, there are two adjustment screws per headlight. One screw controls the vertical aim, and the other controls the horizontal aim. These screws can usually be found on the backside of the headlight assembly.

4. Use the Lisle Tool 14540 or a suitable screwdriver to adjust the headlight aim. This tool allows for easier access to the adjustment screws and makes the process more convenient. Insert the tool or screwdriver into the appropriate adjustment screw and turn it clockwise or counterclockwise to adjust the aim.

5. Start with the vertical adjustment. Locate the vertical adjustment screw and turn it clockwise to lower the beam or counterclockwise to raise it. Aim the beams slightly lower than the marks you made on the wall to avoid blinding oncoming drivers. Ensure both headlights have a similar vertical aim.

6. Move on to the horizontal adjustment. Locate the horizontal adjustment screw and turn it clockwise to move the beam to the right or counterclockwise to move it to the left. Align the beams so that they are centered on the marks you made on the wall.

7. After adjusting the headlights, check the aim by observing the light pattern on the wall. The beams should be level, well-centered, and provide adequate illumination without blinding other drivers. Test the headlights by turning them on and off to ensure they function properly.

Note: The Lisle Tool 14540 is designed to assist in accessing the adjustment screws more easily, but if you don't have this specific tool, you can still adjust the headlights using a regular screwdriver or a suitable tool that fits the adjustment screws.

Always refer to the vehicle's owner's manual for specific instructions and diagrams, as the headlight adjustment process may vary slightly depending on the exact model and year of your Ford F-150.