Built-In Hydrometer

Built-in Hydrometer (Green Dot):

Molded into the top of the maintenance free battery is a built-in temperature compensated hydrometer. Use this hydrometer with the following diagnostic procedure. When observing the hydrometer, make sure the battery has a clean top. A light may be required in some poorly lit areas. Under normal operation, one of three indications can be observed:
1. GREEN DOT VISIBLE

Built-in Hydrometer (Green Dot):

^ Any green appearance in the hydrometer is interpreted as a "green dot." This means the battery is ready for testing.
2. GREEN DOT NOT VISIBLE (DARK DOT)

Built-in Hydrometer (Dark Dot):

^ If the green dot cannot be seen and there is a cranking complaint, refer to "Battery Testing". Testing and Inspection
3. CLEAR OR LIGHT YELLOW DOT

Built-In Hydrometer (Yellow Dot):

^ This means the electrolyte level is below the bottom of the hydrometer and is too low for diagnosis. This may have been caused by excessive or prolonged charging, a broken case or excessive tipping.