414-01 Battery, Mounting and Cables 2014 Fiesta
Description and Operation Procedure revision date: 04/18/2013

Battery and Cables - System Operation and Component Description

System Operation

Battery and Cables

The battery is a 12V DC source connected in a negative ground system and is a voltage stabilizer for the 12V electrical system.

Vehicles with 1.0L EcoBoost or 1.6L EcoBoost engine have a battery monitor sensor attached to the negative battery cable. Refer to: Charging System - 1.0L EcoBoost (90kW/120PS) (414-00 Charging System - General Information, Description and Operation) or
Refer to: Charging System - 1.0L EcoBoost (90kW/120PS)/1.6L EcoBoost (132kW/180PS) - Sigma - System Operation and Component Description (414-00 Charging System - General Information, Description and Operation).

NOTE: The primary purpose of the battery eye is to be a quick indicator of the battery's state-of-charge for assembly plants and dealership pre-delivery processes.

The battery eye indicates the battery state-of-charge by responding to the specific gravity of a single battery cell electrolyte. The battery eye has a viewing plate, 2 colored balls of different specific gravity and a small passage. As the battery's state-of-charge and specific gravity changes, the balls change their position in the passageway and display a different color in the viewing eye.

Do not install a new battery based only on the battery eye color. The battery eye color simply indicates the battery state-of-charge, not its condition. For example, a red or yellow/black battery eye usually indicates the battery is discharged, not defective. If the battery eye indicates the battery may be discharged, recharge the battery before testing its condition.