Jerry,
The voltage to the headlight is a "standard" 12 Volts. But, and it is a HUGE but, the wire size is very small, too small to supply adequate current for a "standard" 7" headlight (incandescent, halogen, or Xenon "projector-style" headlights). The only type of headlight the wires can power is an LED headlight.
A "normal" headlight can pull huge amounts of current. The wire size required is 16 to 14 gauge (for safety). If the wire size used is too small, the light will not achieve its rated output (it won't be as bright as expected)
and the wire may overheat, melt through the insulation, and catch fire. Oops! The wire size on our headlights is in the 20s (perhaps 24 gauge - I haven't actually "gauged" it). IMHO, it is too small to safely/adequately power a "standard" headlight. It can only power an LED headlight (much lower current draw).
J.W. Speaker makes some amazing LED headlights; that is what I have in my fairing and it works very well. There are other LED headlights out there.
If you choose to go with a 7" or similar bucket, you will have to change the connector on the LED bulb you use. J.W. Speaker headlights have about 6" wire leads attached to the headlight; changing the connector was easy. I believe the headlight connector on our bikes is made by Sumitomo (IIRC). You can find the parts you need at
www.motorcycleconnectors.com or other outlets on the internet.
Our headlights are powered by relays. This limits the current draw through the handlebar switch to next-to-nothing. That's a good thing. On many bikes prior to 2000 the healights were actually powered through the handlebar switches which led to dim lighting. The trick was to add relays and larger wiring to maximize the current available to the headlight. Not an issue with the Valkyrie.
Hope this helps a bit.
Bill
