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1. Car Power Basics > 3. Gauge Your Wires

Gauge Your Wires

The general rule in car wiring is that the thicker the wire is, the better. However, thick wire is expensive, and financially it’s worth learning how thick a wire you really need to bring power to all the devices you add to your car.

The width of wires is usually given in a unit called gauge. As with shotguns, a smaller number represents a bigger diameter. Continuing our electricity-as-water analogy, the wider your wire is, the wider a “pipe” the electricity has to go through. Thus, if you are trying to carry a lot of power to your trunk to power a small studio of TV screens, computers, and audio amplifiers, you will want to use a thick wire. But how thick?


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