I have mine wired permanent (which I understand may be illegal).
Question is, are they spotlights or running lights
I'll be doing an electrickery project shortly, so may just fit a switch to 'em - just in case.
I had same problem with a bulb as above (worked, didn't, worked, didn't), decided to replace both with 55 watters (instead of 35).
Noticed a few people adjusting their rear-view mirrors, so replaced 'em with 35w and dropped the beam from horizontal - that fixed it.
I have mine simply to be noticed - the headlight is sufficient for visibility.
One problem; the original bulbs have like 6-8 inch of wire to the spade connector (which will be folded away under the cowel).
Replacement bulbs only have an inch of wire, so, be aware when planning your wiring - you're gonna need an extra 6 inch of positive wire - when replacing the bulb.
Also, there doesn't seem to be any obvious marking regarding the horizontal position of the lens for the beam (so if you don't replace the lens in the unit correctly - you get a 45% angled beam (not FROM the bike to the road, but from side-to-side)).
Basically, the lens unit has a fabric covered drain hole at the BOTTOM. Otherwise; mark the TDC before you disassemble.