Wiper Problem

Hi all

As some of you may know i help out at RSM at the moment, we have just bought an 04 plate 260 ZT from a salvage company, The car has covered 25k miles and is in reasonable condition. It was advertised as a non recorded with mechanical damage this turned out to be it had a large hole in the sump, We patched the sump up to get some oil in it to see if it was knackered or not, It started fine and sounded sweet but as it got warm it developed a slight knock which we are going to investigate further, Now the reason for my post is it has an electrical problem which is when you turn the ignition off the wipers start going and wont stop until you turn the key to position 1 has anyone come across this before?

thx
Alan

When I had my sat-nav fitted, the wipers came on when the ignition was switched off, although they only wiped once and stopped.

The reason was traced to the feed wire and the ignition controlled feed wires being reversed.