Battery Hydrometer Displays Dark or Yellow Dot

1. The battery has a built-in hydrometer (1).

The hydrometer lens provides a visual indication of the condition of the electrolyte.

2. Tap lightly on the lens and observe the built-in hydrometer (1).
3. Under normal operation, one of three color conditions on the hydrometer (1) is possible:
^ Green ball visible (2).

This condition indicates a sufficient state of electrolyte (5) charge (65 percent or above) for normal charging system operation.

^ Dark lens (3) (Green ball not visible)

This condition indicates an insufficient state of electrolyte (5) charge (below 65 percent). Recharge the battery before further testing.

^ Clear lens (4) (Yellow lens)

This condition indicates that the electrolyte (5) is low. The battery electrolyte (5) cannot be refilled. Replace the battery.

4. A low electrolyte (5) level can be caused by any of the following conditions:
^ Prolonged charging
^ An excessive charge
^ A broken case
^ Excessive battery tipping
5. When finding a battery in this condition it may indicate high charging voltages caused by a faulty charging system. The charging and electrical systems should be checked.
6. If there is a cranking complaint, inspect for trouble in the charging or electrical systems.
7. If a cranking complaint exists and is caused by the battery, the battery should be replaced.