Battery light?

Hi,

I need you to perform something for me. It sounds like the alternator isn't producing what it needs to.

All you will need is a multimeter or voltmeter. I need to know the voltage at the battery with the engine running and with it off. Follow the directions in this link and let me know what you find:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Let me know if that is something you can do or if you have other questions.

Take care,

joe

Hi,

I have gone through several schematics and found nothing that is physically tied together that would cause what you described.

If you look below, I attached the wiring schematic for the charging system.

At the PCM, you have KAPWR which is keep alive power. That is constant power to the vehicle for things such as the clock and radio settings.

The GEN-COM signal represents the commanded voltage set point for output. This communicates with the PCM to determine output.

At the PCM, the GEN-MON is last. This stands for the generator monitor which sends a signal to the PCM based on the alternator load and output.

The other two wires are battery voltage wires. If the alternator has tested good, I suspect something may be happening at the PCM.

After the wiring schematics below is a definition of how the circuit functions. After that are basic diagnostics. Take a look through them and let me know if you are comfortable performing them.

Take care,

Joe

See pics below.

Hi,

You are very welcome. I'm glad to hear you found the problem.

Please feel free to come back anytime in the future. You are always welcome.

Take care,

Joe