I've had a 57 plate 2.5 TDI since November, with a view to converting it to a camper. Everything seemed fine until I had to drive it thru floods in December. Soon after, the alarm started sounding intermittently, the central locking stopped working, and the battery lost its charge. The local garage checked the battery, which was dead. I've recently bought a new battery and replaced the corroded red and blue wires under the drivers seat. This worked for about a week or so, but then the alarm started going off again and the battery has drained again. I've had a look in the consumer unit under the drivers seat and this seems fine, but something must be draining the battery while the van is sitting on the drive. Any ideas please?