This is a big problem most anywhere. Apparently the covering on most of the wires in vehicles are made out of something that rodents and small animals really love to eat. So mice, rats, rabbits, squirrels, and most any small critter like that can get in there and cost a lot of damage. Back before I retired we had a bunch of brand new police cars that they stored at the City Corp Yard for a few months while waiting to be put into service. During that time rabbits got into all of them and did several thousand dollars damage to each car.