Headlights
Upgrades
X1/9s use a common 7" diameter high/low headlight used in many other vehicles. Aftermarket headlights and headlights with replaceable bulbs are also available, though some of these are for "off-road" use only. Check local laws before changing your headlights. When using many aftermarket headlights, you must alter the wiring in the headlight socket to match the needs of the bulb, as with an H4 bulb. H4 bulbs are available in 55/60w, 80/100w, even 100/120w. When you consider that most original 7" bulbs were 35w it's easy to understand why upgrading the wiring is needed.--Gregory 14:38, 16 September 2009 (UTC)
Supply voltage
Regardless of the headlights you have, low voltage or bad grounding will not allow them to operate to their fullest potential. The relay instructions on the BrownWire mod page will ensure that full voltage is provided for the headlights and is a requirement for aftermarket lights.--Gregory 14:38, 16 September 2009 (UTC)
Headlight motors
Headlight Switch
Proper Aiming
Aiming your headlights is essential for proper function and safety. Simply put, the high beam or mains bright spot should be centered in front of the car at the same distance from the floor as the headlight center, as measured at a distance of 25'. When switched to low beam or dipped, the bright spot will be on the pavement ahead of the car. Always test drive to make sure the aiming is successful.--Gregory 14:38, 16 September 2009 (UTC)