Who told you ?
i was told the only thing left it could be is a bad ground wire but not positive i dont want to spend all the money to find which ground wire if it could be another problem or it there are any other solutions??
The charging system on your vehicle is computer controlled . GM calls it smart charging system . Running diagnostic check on all the modules on the vehicle may shed some light on the problem . Need a professional or factory scan tool to do this . The instrument cluster turns on the battery light when told by the BCM - body control module . A lot of complex electronic involved here , class 2 serial data communication network , modules sharing info on this network . It's hard to under stand whats happening when you don't know how all works .
Charging System Indicator
The body control module (BCM) sends a message to the IPC via the serial peripheral interface (SPI) requesting illumination. The IPC illuminates the charging system indicator when the following occurs:
• The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The BCM receives a class 2 message from the PCM requesting illumination. The also BCM sends a class 2 message to the radio in order to activate an audible warning.
• The IPC performs the displays test at the start of each ignition cycle as commanded by the BCM. The indicator illuminates for approximately 3 seconds.
• The PCM determines that the ignition is on, with the engine off or the ignition is in the accessory position. The BCM receives a class 2 message from the PCM requesting .
GM also had instrument cluster problems 2003 to 2006 . Buy a used one for $ 20.00 bucks at a automotive salvage yard an see if that fixes the problem . Without testing , check codes , this is just a guess .
Are You Smarter Than Smart Charging System MOTOR
Voltage Drop Testing the Charging System
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