GM Service Manual Online
For 1990-2009 cars only

Battery Hydrometer Displays Yellow Dot

Step

Action

Value(s)

Yes

No

Caution: Batteries produce explosive gases. Batteries contain corrosive acid. Batteries supply levels of electrical current high enough to cause burns. Therefore, in order to reduce the risk of personal injury while working near a battery, observe the following guidelines:

   • Always shield your eyes.
   • Avoid leaning over the battery whenever possible.
   • Do not expose the battery to open flames or sparks.
   • Do not allow battery acid to contact the eyes or the skin.
      - Flush any contacted areas with water immediately and thoroughly.
      - Get medical help.

 

1

Was the Battery Check performed?

--

Go to Step  2

Go to Battery Check

2

Tap the hydrometer lightly on top with the handle of a small screwdriver to dislodge any air bubbles inside the battery.

Is the hydrometer dot still yellow?

--

Go to Step  4

Go to Step  3

3

Does the hydrometer display a green or dark dot?

--

Hydrometer OK

Go to Step  4

4

Replace the battery. Refer to Battery Replacement in Engine Electrical.

Did you complete the replacement?

--

Go to Step  5

--

5

Visually inspect the hydrometer in the new battery.

Does the hydrometer display a green dot?

--

Go to Step  11

Go to Step  6

6

Does the hydrometer display a yellow dot?

--

Go to Step  7

Go to Step  9

7

Tap the hydrometer lightly on top with the handle of a small screwdriver to dislodge any air bubbles inside the battery.

Is the hydrometer dot still yellow?

--

Go to Step  4

Go to Step  8

8

Does the hydrometer display a green dot?

--

Go to Step  11

Go to Step  9

9

Does the hydrometer display a dark dot?

--

Go to Step  10

--

10

Charge the battery. Refer to Battery Charging in Engine Electrical.

Was the battery recharged?

--

Go to Step  11

--

11

Check the charging system for proper operation. Refer to Charging System Check in Engine Electrical.

Is the charging system OK?

--

Hydrometer OK

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