Electrical Requirements

• Determine the voltage of your motorcycle's electrical system. Most modern motorcycles use a 12-volt DC, or direct current, system to power their electrical components, while some dirt bikes and older motorcycles still employ a 6-volt DC system. A 12-volt system is required in order for your headlights to be compatible with newer parts. The motorcycle's battery must be able to handle the additional loads placed on it by the light. You might want to purchase a battery with a higher amp hour rating, the maximum sustained power drawn from a fully charged battery over the period of an hour, to provide a larger power source.
  
  

Headlight Options

• Headlights are available in a wide variety of styles and can provide a suitable amount of light to illuminate the road or trail. The lights are often sold in pairs, each powered by a single-filament bulb, meaning there isn't a high and low beam option on a single light. To compensate for this, you could wire one light as the low-beam and use its matching light as a high-beam. Or you could wire them together to provide a greater amount of light without the ability to select between high and low beams. These lights can be controlled through a factory-equipped handlebar mounted switch, if your bike has one, or through a toggle switch you can install on your bike.
  
  

Mounting the Lights

• Mounting the lights can be done easily with fork-mounted headlight brackets. These brackets are available from most motorcycle accessory suppliers and are designed to fit 38 millimeter or smaller-diameter forks. These are inexpensive and easy to mount. Since the fork brackets are meant to mount a single large headlight, which prevents the brackets from rotating freely, a cross-beam-type bracket must be fabricated to fit in its place between the fork brackets. The cross beam will also serve as a suitable mounting location to secure the lights. The lights may be arranged either on top of each other or side by side. If you are going to use a high-low beam setup, aim them accordingly. The low beam should illuminate the road a short distance ahead of you without blinding other drivers. The high beam can be aimed higher to brighten the road farther ahead.