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My guess is a bad voltage regulator. And for whatever reason, those lights go first when the voltage spikes.
+1 good call. Happened to my wifes' 2012 Heritage, weird electrical things kept happening like turnsignal bulbs lasting only a few months and whatnot. Turns out it was the voltage regulator was under a recall anyway and had it replaced. Problem solved.
Do you have the passing lamp bulbs that have the little pig tail power wire coming off of it?
Because it seems to occur in the wet, check that you have the power wire going to the grey (I think) wire and that the earth wire is plugged into spade terminal for the headlamp shell (black wire) and not the other way around.
Have you checked the continuity of the bulbs that are suspect to ensure that they've blown and it's not just a bad earth causing them to go out?
Often a decent tap on the passing lamp shell can "magically" make the bulbs come back on and indicates a poor earth.
Not sure which lamps I have - From what I remember, you can't get easy access to switch the bulb (The shop has always done it). I'll need to take it apart and check. But i've slapped the hell out of them to get them back on - it did work once on a previous set of bulbs, but not again since.
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