Molded into the top of the maintenance-free battery is a built-in temperature compensated hydrometer. Ensure that the battery top is clean when observing the hydrometer. Use a flashlight in order to observe the hydrometer in poorly lit areas. Do not produce any sparks. Use this hydrometer with the following diagnostic procedure.

Under normal operation, 1 of the following 3 indications will be observed:

1. The green dot is visible (A).

•	Any green appearance in the hydrometer is interpreted as a green dot.

•	The green dot means the battery is at least 65 percent charged and is ready for testing. Refer to Battery Not Operating Properly .

2. When the green dot can not be seen (B). The charging is below 65 percent.

•	If there is a poor cranking comment, refer to Generator Not Operating Properly for further testing.

•	In order to Inspect the charging system for excessive draw, refer to Battery Electrical Drain/Parasitic Load .

3. The dot appears clear or light yellow (C).

•	A diagnosis can not be made at this fluid level.

•	A clear or light yellow dot means that the fluid level is below the bottom of the hydrometer.

The following can cause a low fluid condition:

A battery found with a low fluid condition can indicate a high charging voltage, caused by a faulty charging system. The charging system must be checked for specified output. The electrical system must be tested for a parasitic drain. Refer to Charging System Check .

Replace the battery when there is a yellow or clear hydrometer along with a cranking comment. Refer to Battery Replacement .