Brand new battery, brand new alternator, battery light still on after resetting it

Hello, is this car equipped with a battery temperature sensor. Located under the battery? Heres the resistance test: Disconnect the heater blanket from the vehicles electrical system. Using an Ohmmeter, connect the leads across the two wire terminals coming from the heater blanket. A resistance value of 220 to 280 ohms should be present. If not replace the blanket. And is there any diagnostic trouble codes stored? The light is turned on by a PCI BUS circuit, with the voltage regulator built into the ECM.
Heres some other info I found in All Data:
The PCM uses the ambient air temperature sensor to control the charge system voltage. This temperature, along with data from monitored line voltage, is used by the PCM to vary the battery charging rate. The system voltage is higher at cold temperatures and is gradually reduced as the calculated battery temperature increases.

The ambient temperature sensor is used to control the battery voltage based upon ambient temperature (approximation of battery temperature). The PCM maintains the optimal output of the generator by monitoring battery voltage and controlling it to a range of 13.5 - 14.7 volts based on battery temperature.

Let us know what you find out about the ECM, if it doesn't do the trick we'll have to do some voltage drop testing. I would take a real good look at the ECM pins too, a loose fitting connection or bad wire, there's many possibilities.

The audio system is drawing too much power for your vehicle's charging system to handle. If you wish to keep the system without damaging your vehicle's charging system I suggest having a separate battery installed soley for the audio system to run on. Otherwise you will have to turn down the bass. Engine code for oxygen sensor can come on for faulty wiring to oxygen sensors or for a faulty catalytic converter. Symptoms of either of these would be poor fuel mileage.

Thanks for using 2CarPros. Com!

The battery is only used to start the vehicle, the alternator is what is used to run the vehicle. Suspect faulty voltage regulator. The regulator is built into the alternator.

Check all ground and power wires for the charging system to ensure they are clean and tightened properly. Is battery new? Check water level of battery.

What was the voltage at when you say it was high? Was it greater than 19 volts? If so then the alternator is at fault. Have you replaced the alt. Or just tested it?

Start by having the charging system tested by a mechanic, not at an auto parts store. Tell me what they find for "full-load output current", "charging voltage", and "ripple voltage". The test just takes a few minutes.

Is that the red "brake" warning light or the yellow "anti-lock" brake system light?

It is possible. Have you tried disconnecting the power wire of the system? If the lights are flickering than there can't be too much voltage rather not enough. There is something screwy with the audio set up. Either the amp is not adjusted properly or perhaps the speakers or aftermarket radio are not hooked up properly.