I feel your pain, a few years ago I had a Jeep Liberty which was parked in front of my garage for a few days. When I went to use it, the alternator idiot light was on! I pulled back into the driveway and opened the hood to see if there was a loose wire etc. Finding no problems with the alternator I noticed that the insulation on the underside of the hood was torn and chewed back by the passenger side firewall. After further examination, I found chewed wires and more insulation.
Talking to some friends at work, they speculated that is was a possum.
After soldering all of the wires back together, everything worked. But the next night I came out of the garage to see a young woodchuck jump down from under the Jeep and run for a hole behind the house. I ran into the house to grab my rifle, but decided that, my deer rifle was a little too much for around the house. It was time to buy a new 22. When I told the story to the guy at the gun shop I thought he was going to pee himself laughing. It took a couple of evenings sitting in a lawn chair waiting, but there was to be no more chewed wires.:thumbsup: