So this morning when I wake up I go and disconnect my negative terminal to reset the ecu, 20 mins later I got connect it and the car starts up fine I drive for about 30 minutes everything is fine. About 2 hours later I try and start it and my gauges come on and then die. It seems like power is turning off/on. So I check all connections everything seems good. I test my battery with my mulitmeter 12.6 volts. Car still wont start, nothing. So I jump it and it starts right up. Now my battery light is on, I drive it a little and then I start to hear like a belt whining noise, so I limp it back to my house. (Thinking its the alternator).So I pop the hood and the noise it gone I try revving it up and its silent, the noise only happens when the car is in gear under load So I turn it off and all power is lost again. But my battery still has 12.6 volts.I jump it again and the battery light is off and I test the voltage at the battery when runnning it's 13.7. I pull out and the noise is still there bring it to my driveway pop the hood, rev it up no noise. Is this my battery or my alternator or both?? I dont know whats going on here, Its just one problem after the next. Someone help me out.