90CS Quattro V6-2.8L (AAH) (1994)
Battery: Testing and Inspection
Battery, Checking
A weak battery can be caused by:
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Generator (GEN) drive belt slipping (replace belt if glazed).
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Ground (GND) straps corroded, loose or broken.
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Generator or voltage regulator malfunctioning.
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Generator warning light -K2-bulb failed.
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Poor Ground (GND) connection between generator warning light -K2- socket and circuit board.
Battery and cable terminals should be cleaned and coated with acid-resistant grease to prevent corrosion.
Visual checks
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Check for cracked or leaking battery case.
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Check for loose or corroded terminals.
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Check electrolyte level (below MIN mark). If electrolyte is low, refill with distilled water and charge battery for several minutes after cells begin
gassing (boiling).
CAUTION!
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DO NOT overfill. Overfilled batteries can boil over.
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Too little electrolyte reduces the service life of the battery.
Hydrometer test (specific gravity)
(Batteries with removable caps)
NOTE: Calibration of the hydrometer must be checked frequently to ensure accuracy.
CAUTION!
DO NOT expose a fully discharged battery to freezing temperatures; the battery will be damaged.
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Test electrolyte in all cells.
Average specific gravity should be at least 1.225
Specific gravity
% charge
1.265
100%
1.225
75%
1.190
50%
1.155
25%
1.120
0%
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Correct for electrolyte temperature if necessary:
- For each 10° above 80 °F (26 °C), add 0.004 to hydrometer reading
- For each 10° below 80 °F (26 °C), subtract 0.004 from hydrometer reading
If specific gravity is above 1.225:
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Load test battery.
If specific gravity is below 1.225:
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Charge battery.
If specific gravity varies by more than 0.050 between cells:
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Replace battery.