How to wire a headlight??

ya might wanna do a search using those terms, headlight and white wire
there has been a LOT of discussion about this.

You will need a switch so you can turn off the light, connect one wire to the bulb center and one wire to the bulbs side one wire will go to ground and the other through the switch to the white wire. If I knew how to draw on the computer I could show you better.

bulb-----------switch-------------white wire to engine
bulb-----------------------frame ground or ground the wire to the engine