When Squirrels (or other rodents) eat your car's electrical wires

[Grackle]

Mice. rats and squirrels do not eat your wiring because they think it tastes good and is good for them. They probably do so because they crave some mineral or salt that is unavailable to them. Buy a small mineralized salt block at a pet store and put it under your car. It should prove more to the taste of the rodents and save your wiring. This is cheap and easy to do, and seems to be protecting my cars.