No help with your situation. My only recommendation is to contact Busch Mueller directly and see if they maybe have a new version of the light and will replace your light.
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Also, it looks like Bush & Muller themselves updated the construction, making the remote hard-wired to the headlight body, allegedly because of the possibility of water getting in:
I simply don't understand why people keep buying these lights.
Against my better judgement, I bought one of these Luxos U lights last year, thinking it would be the best since sliced bread. For me, not so much. I felt like the whole thing was flakey at best, large and obtrusive, and very ugly! When mine failed completely after a month, after getting wet, I returned it, got and Edelux, and never looked back.
Stage 2: Partially dismantled *DO NOT TOUCH CONTACTS* unless you want a kick from a capacitor, no idea if they are powerful enough to have an effect but that's your warning <---
I dried the clearly visible board first and things improved, but see the smaller one up under the reflector? That's the one you want to get out, there was a small pool on top.
Step 3: Reassemble! This is the bit I always gave up on as a kid, pack the capacitors something like this:
Then pop the lens/reflector assembly back in without letting the capacitors jump out of place, it may take a few attempts but all fits neatly with no forcing/squashing. Once you've failed a few times you'll notice the black cable bundle behind them needs you be coiled out of the way like so:
Step 4: Go ride in the rain more! It's been 1 month since I did this repair and the light is performing as new. If yours is positioned where wheel spray can hit the back contacts I suggest you move it or shield it.