If your car spends alot of time in storage then it can become vulnerable to rats chewing the wiring. They do it to relieve boredom and to control the growth of their teeth. Rats teeth would grow by 4 to 5 inches per year if they didnt chew hard things regularly.
The solution is one of our trapping tunnels and Fenn Mark4 trap. You do not have to bait it. It is set and forget. Get the direct from https://trapbarn.com