
I thought that same thing after I posted it... Oh well, the "children" probably won't get it anyway.
The wipers have nothing to do with it, I usually use Rain-X, since I hate flicking the wipers on and off constantly, and leaving them on in a drizzle sucks.
It is quiet, so it is most noticeable when parking, just after engine shut-off, but before hitting the light switch. At first I thought it was just coincidence, the connection between the lights, and the noise, but I've pretty much nailed down that they are the source.
Geri Lou's under-dash wiring is a mess. I've been meaning to clean it up since I got her, but something more pressing always comes up.
As for wipers, don't try and listen to AM radio with the wiper on! rrrrnnnnn-rrrrnnnnn, rrrrrnnnnn-rrrrrrnnn