Choose a spot on or near the firewall for the common ground point for the harness, and one point for a chassis ground on the negative side of the vehicle. This method gives you a single path to the negative side of the vehicle and provides a more effective ground. Use 10 gauge or bigger wire to connect the common ground to your chassis ground.
As you know, electricity travels in a current. The purpose of the fuse box is to stop the electrical current if it becomes to strong, thereby avoiding an electrical fire. The wire harness carries the current from the engine back to the fuse box, usually found under the driver’s side dashboard. When power reaches the fuse box, it is then redirected to the various different electrical components of your car, including back to the engine, to the overhead light, to your instrument panel and to hundreds of other vital components.
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