What happens if you hook up battery backwards?
What happens if you hook up battery backwards? When a car battery is connected backward, a fuse designed to protect vehicle electronics should blow. If your vehicle doesn't have a fuse (almost all cars do) designed for this purpose, you will send electrical current backward through systems in your car, including ECU, transmission control unit, and more. How do you put batteries in end to end? Slide the battery into place with the negative end first. As you insert the negative end of the battery, you may press down a spring or a lever. By installing the negative end first,...