Guide Section: Electrical

Sometimes called the "Big 3" or "Big 4" or "Big 5" or even "Big 7" wiring upgrade, the idea is to increase the wire size between high-powered components in the engine bay in order to carry extra current, or to carry the same current with lower voltage loss. This is necessary if you're planning to upgrade your alternator, or if you have accessories - a sound system, winch, lighting, etc. - that require more power than the stock components and wiring can handle. Big 3 - this is the "basic" upgrade; all three of these need to be done first,…