If rat enters your Ford Fiesta Car engine bay and destroys your cables, you can easily install Varna Ultrasonic Rat Repellent following the instructions below.
Fix the repellent facing the bonnet firmly using plastic tags. Let there be enough clearance when the hood is in closed position.
The red wire to be connected to the positive terminal and black wire to the negative terminal. The unit will start functioning. You can notice the desired results within 1-2 weeks.