VW Golf manuals

Volkswagen Golf Service & Repair Manual: Checking colour indicator, “3-colour”

  WARNING
Danger of injury! Observe warning notices and safety regulations → Chapter!
General information about colour indicator:
Applies for all batteries with “1J0”, “7N0” and “3B0” indexes in original equipment and for all replacement batteries 191 915 105 AB and from “000 915 105 AX” index.
The colour indicator provides you with information about the electrolyte level and charge state of the battery.
Before carrying out a visual check, tap the inspection window lightly and carefully using the handle of a screwdriver. The air bubbles, which can influence the display, will dissipate when doing this. This will make the colour indicator reading more accurate.
  Note
Air bubbles can form under the sight glass, particularly when a battery has been recharged, i.e. also when the battery has been charged during normal vehicle operation. These falsify the reading of the colour indicator.
Since the colour indicator is only located in one battery cell, the indicator also only applies to this battery cell. Determining the exact condition of the battery is possible only by means of a battery test → Chapter.
The colour indicator can be located at various positions on the battery.
Three different colour displays are possible:
»Green«, battery is charged sufficiently.
»Black«, battery partly discharged, charge state < 65% or completely discharged
»Colourless or light yellow«, battery must be renewed.
  WARNING
It is not permissible to test or charge batteries whose colour indicator is light yellow. Do not slave/jump start the vehicle!
Danger of explosion when checking and charging or slave/jump starting.
These batteries must be renewed.
   
Visual check
  WARNING Danger of injury! Observe warning notices and safety regulations → Chapter! ...

Checking colour indicator, “2-colour”
  WARNING Danger of injury! Observe warning notices and safety regulations → Chapter! ...

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