Question about Saab 9 3
If warning appeared there have been a problem , even if this happened only temporarily.
I suggest going to the nearest garage and having a look, or at least going to Autozone and doing a free code reading to see if any error code is stored in the car computer.
This kind of problems are usually caused to a bad wiring to alternator or to battery. A bad power regulator, or electronic load detector can also cause the problem.
If you want to test battery and alternator do the following.
Keep engine off and read the voltage at battery terminals. Voltage must be a minimum 12.4 Volts at alternator must have a drop of about 0.2 Volts. This test is done with engine off and car stereo, lights, Alarm etc. off.
Turn on the engine and read again. With engine on, the battery must have a minimum of 13.5, the drop at alternator must be same as before, with 0.2V difference respect to battery.
If battery is below this values, then replace battery.
Posted on Nov 15, 2009
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Posted on Jan 02, 2017
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