1. Preparation:
* Park on a level surface: This is crucial for accurate adjustment. Find a flat, even area, preferably against a wall or garage door.
* Measure the distance: Measure 25 feet from your Jeep's headlights to the wall. Mark this distance clearly.
* Turn on your headlights: Ensure your headlights are on low beam.
* Find the adjustment screws: These are usually located on the back of each headlight housing. You might need a Phillips head screwdriver. They're often small and might require a flashlight to see clearly. One screw adjusts vertical aim.
2. Adjusting the Headlights:
* Mark the headlight beam: With your Jeep parked at the 25-foot mark, the headlight beam should ideally create a horizontal line on the wall at or slightly below the center of the headlight. Mark the current position of the beam on the wall.
* Adjust the vertical aim: Using the adjustment screw(s) on the back of each headlight housing, you'll raise or lower the beam. Turning the screw clockwise typically raises the beam, and counter-clockwise lowers it.
* Make small adjustments: Make small, incremental adjustments and check the beam's position on the wall after each turn. Avoid making large adjustments at once. The adjustments are usually very sensitive.
* Aim for the correct height: Adjust the beam so that it's level or slightly below the center of the headlight at the 25-foot mark. This ensures you're not blinding oncoming drivers while still having adequate illumination.
3. Important Considerations:
* Owner's Manual: Consult your Jeep Cherokee's owner's manual for the specific instructions and diagrams for adjusting your headlights. The location of adjustment screws might vary slightly depending on trim level.
* Passenger and Driver Side: Adjust each headlight individually. They may need different adjustments.
* Professional Alignment: If you're unsure about adjusting them yourself, take it to a professional mechanic or auto shop. They have specialized equipment to ensure accurate alignment.
* Loaded Vehicle: Keep in mind that a heavily loaded vehicle will cause the headlights to aim lower. You may need to readjust after significant changes in weight.
If you can't find the adjustment screws easily, consult a repair manual specific to your 1999 Jeep Cherokee model. Pictures are often very helpful. Remember safety first; if you're not comfortable working on your vehicle, seek professional help.
