I replaced the bulb in my B&M headlight (I believe it's the N2 plus Standlight) the other day. The new bulb is from another of the same light, and works fine BUT
the standlight no longer works
my taillight no longer works.
The taillight is wired to the front-most connection of the headlight (there are three downward-facing prongs on the light) and to ground, using a single wire to the back of the bike.
Has this happened to anyone else?
I feel I may have loosened something inside the light when replacing the bulb.
Did you change the wiring when you replaced the bulb? If not, you know you didn't mix up anything; if so, check B&M's literature for how the wires should be run. Did the taillight and headlamp-standlight continue to work with the blown-out old bulb? If so, you know that circuit doesn't rely on current through the bulb; if not, maybe it'd be worth it to try out a completely new bulb.