INFINITI

A: The positive battery cable transmits power to the vehicle's computer, and starting and charging system, while the negative battery cable is connected to the chassis to provide a universal electrical ground for the entire vehicle. This creates a closed-loop system where power can continuously flow through the battery, and power all vehicle functions.

A: The battery is considered “dead” when there is insufficient charge to start the engine, or run electrical components. When battery cables fail, this condition will occur. Normally, the first sign is dim lighting in the interior of the vehicle, and when attempting to start, the engine may crank extremely slowly, or not at all.

A: Vehicles with manual transmissions can be manually started by pushing the vehicle to considerable speed, and releasing the clutch quickly if the battery is dead. This method is commonly called push-starting, and is an effective method of manually starting the engine using the vehicle's transmission to turn the flywheel.

A: Battery cables fail at no specific mileage interval or age. The older a battery cable, the more brittle the sheathing will become, and exposure of the bare wire to the elements will accelerate failure. It is most typical to experience battery cable failure after several years of use, or in the case of improper installation.

A: Battery replacement for most vehicles is typically fast and easy. The battery cables should be removed, any battery insulation material will be removed, and the battery retaining bracket will be loosened or removed. The battery will then be free to removed. The new battery will be installed in the reverse order of operations.

A: Replacing the battery cables is a great DIY project that can be completed in short order for most vehicles. However, there is a risk of electrical shock and other electrical component failure if arcing occurs at the battery terminals, or if the battery is not disconnected first. Prior to performing this service, the vehicle's battery location should be noted, as well as which components the battery cables power directly. If the location requires much disassembly, this job will be best trusted to a trained technician.