Here's why:
* The Basics: Most cars use a negative ground system. This means the car's frame, body, and engine block are all connected to the negative (-) terminal of the battery. The positive (+) terminal is used to power the electrical system.
* Historical Context: Early cars, particularly in the 1950s and before, sometimes used positive ground systems. In this setup, the frame and body were connected to the positive (+) terminal of the battery, and the negative (-) terminal was used for power. This system was less common and is practically non-existent in modern cars.
Why Negative Ground is the Standard:
* Safety: Negative ground offers better protection against electrical shock. If a wire from the positive terminal breaks, the current will flow to ground (the frame) and the risk of shock is lower.
* Simplicity: Negative ground systems are easier to wire and maintain.
* Compatibility: Most modern automotive components are designed for negative ground systems.
So, what about those "positive ground cars" you might have heard about?
It's likely you're encountering these terms in a few scenarios:
* Vintage Cars: If you're working on a very old car, it might be positive ground. You'll need to consult the specific owner's manual or a repair guide for your car model.
* Misinformation: The term "positive ground car" is often used incorrectly. It's essential to understand that nearly all modern cars use a negative ground system.
* Specialized Applications: There are rare instances where a positive ground system might be used in a specific application or for a particular type of vehicle, but this is not the norm.
Bottom Line: Unless you're dealing with a very old car, you can safely assume your car has a negative ground system. If you're unsure, check your owner's manual or consult a mechanic.
