Hi I've just purchased a 66 beetle which has been converted to 12v. The wipers are very fast and I was going to install a variable resisitor in line, and hide it under the dash. Would this be feasible or would it create to many wiring problems. I surmise the wiper motor is still 6v.
Regards Driff66

Yes that will be the cause. I had the same problem with my 1957 oval as a previous owner had converted it to 12 volt and left the 6 volt wiper motor in place. It ran so fast that it threw a wiper arm off the spindle and into the road!
I fitted a dropper unit made and supplied by Peter Good of Volksgoods. He makes one especially for wipers and it works superbly.

www.volksgoods.co.uk

Peter has recently rebuilt me a 6 volt generator, so before the car comes out of hibernation in 2009 I'm converting it back to 6 volts.

Excellent!
RoRoVw......I hope you retrieved the wiper!!
I also have a dropper relay and it works well on my 66 beetle which has also been converted to 12 volt.
:d

Oh yes the wiper was retrieved intact, thanks. Far too valuable to leave in the road!