VW Golf manuals

Volkswagen Golf Service & Repair Manual: Checking colour indicator, “2-colour”

  WARNING
Danger of injury! Observe warning notices and safety regulations → Chapter!
General information about colour indicator:
The general introduction of the “2-colour” indicator took place gradually in 2009. The “2-colour” indicator does not include »green« to indicate the charge state.
The colour indicator provides you with information on the electrolyte level of the battery.
The battery's charge state can no longer be read off via the colour indicator. The battery test has to be used for this purpose, → Chapter
Before carrying out a visual check, tap the magic eye lightly and carefully using the handle of a screwdriver. The air bubbles, which can influence the display, will dissipate when doing this. The colour display of the magic eye will therefore be 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 only possible 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:
»Black«, electrolyte level is OK.
»Light yellow«, electrolyte level too low. The 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.
   
Checking colour indicator, “3-colour”
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