Built-In Hydrometer

Built-In Hydrometer:

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
- Any green appearance in the hydrometer is interpreted as a "green dot." This means the battery is ready for testing.
2. DARK DOT, GREEN DOT NOT VISIBLE
- If the green dot cannot be seen and there is a cranking complaint, proceed to "Diagnosis of the Battery" for further testing. The charging system should be tested for output and the electrical system should be tested for excessive draws.
3. CLEAR OR LIGHT 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. 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 must be tested. The battery should be replaced if a cranking complaint exists and the battery has a yellow or clear hydrometer.