Once in a while it might come up to 13volts but never higher. i will have a fully charged battery and the volts slowly drop to where it quits. battery and alt new
Volts slowly drop to where what quits ,The vehicle stops running ? Is the charge indicator light lit on the instrument cluster /? are any lights lit on the instrument cluster ?
The instrument panel cluster (IPC) illuminates the charge indicator and the BATTERY NOT CHARGING message is displayed in the message center when the following occurs:
The engine control module (ECM)/powertrain control module (PCM) detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the ECM/PCM requesting illumination.
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The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the body control module (BCM) indicating the system voltage.
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The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
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The ignition is on, with the engine off
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