My stock headlight was terrible, so I put on a 7", first a tribar, and a Sylvania car lamp. the lights were still terrible. A car behind me would blot ut any headlight beam I had. It was like the the light beam just kinda dribbles out in front of the bike and fell to the ground. An old flashlight put out better light.
I fiddled around with the wiring and switches for months off and on, trying to find where I was losing over 1/2 V between the battery and light. still don't know where that was going.
Then my dealer suggested installing relays, so I finally got around to doing that. The relays are controlled by the original wiring with new bigger wiring running from the battery to the headlight. No voltage drop now! I haven't messed with the sotck, but the Sylvania and H4 Tribar put out some decent light now, but the Sylvania has a much better beam pattern than the Tribar. I finally kept the tribar in the bike because it looks better, and I don't ride that often at night anyway.
Bare