Hi,
i bought a 2.5 dt 3 months ago with electrical faults which got worse over the following 7 days. The lights stayed on even though they were switched off, the suspension dropped to the stops, the wipers wouldn't park and the central locking didn't work. I changed the fuse box in the engine compartment for around 115 pounds and it solved many of the problems instantly. There was a strong burning smell from the fuse box before changing and on stripping it there was signs of shorting out across the soldered joints.
kevin