Built-In Hydrometer

Built-In Hydrometer:

The maintenance-free battery has a built-in temperature compensated hydrometer in the top of the battery. This hydrometer is used with the following diagnostic procedure.

When observing the hydrometer, make sure that the battery has a clean top. A light may be required in some poorly-lit areas. Tap the hydrometer lightly on top to dislodge any air bubbles that might cause a false indication.

Under normal operation, two indications can be observed.
1. GREEN DOT VISIBLE
- Any green appearance is interpreted as a green dot" and the battery is ready for testing.
2. DARK - GREEN DOT NOT VISIBLE
- If there is a cranking complaint, the battery should be tested as described in "Battery Testing". Refer to Testing and Inspection. Testing and Inspection The charging and electrical systems should also be checked at this time.
- Occasionally, a third condition may appear:
3. CLEAR OR LIGHT YELLOW
- This means the fluid level is below the bottom of the hydrometer. This may have been caused by excessive or prolonged charging, a broken case, or excessive tipping. When finding a battery in this condition it may indicate high charging voltages caused by a faulty charging system, therefore, the charging and electrical systems should be checked. If a cranking complaint exists and is caused by the battery, the battery should be replaced.