Question about 2000 Pontiac Grand Am GT
Most automotive systems are designed to be tolerant of low voltages down to the 6-7 volt range but there is no guarantee of that and with a battery toward the end of its life, the terminal voltage can fall well-below 10V during starting.
The system voltage to some circuits can fall to near zero if battery terminals or cable ends are corroded causing the available voltage to drop completely across the bad connection due to the high current the starter tries to draw and this can certainly cause problems with security systems and cause the stereo to fail to turn on without re-entering a factory code sequence.
BTW, on later vehicles, it is wise to pick up a cheap device from an auto parts store that uses a standard 9V battery and the cigarette lighter receptacle to prevent loss of such codes if the vehicle's battery must be disconnected for any reason. That voltage is enough to preserve various settings and stored values but do not leave it plugged in after the main battery is reconnected; it may explode.
Posted on May 29, 2011
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Posted on Jan 02, 2017
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