Capitulo 2 - AUTOMOTIVE ELECTRICAL CIRCUITS AND WIRING

caps (vent plugs) allow gas to escape and prevent the electrolyte from splashing outside the battery. They also serve as spark arresters (keep sparks or flames from igniting the gases inside the battery). The battery is filled through the vent plug openings. Maintenance-free batteries have a large cover that is not removed during normal service.

  Plugs, Spark