Rick, How about developing a solid state wiper motor relay for the intermittant Fn of the wiper. The loud click of current relay drowns out the stereo!

 

If you have a stock stereo, just about Anything will drown it out!

Sorry, I just don't get it. There is so much about the Stook that is loud (engine, transmission, exhaust, wind noise, road noise), how can you be bugged by the intermittent wipers? If they're really that loud, may they're defective?

Just a thought...