Driving to work today my 2003 Accord's battery light came on. It stayed on for the remainder of the day. I was able to drive around with it on until I started to look around under the hood. Here is what I noticed. With everything off and the doors closed the voltage is around 12.3. If I open the door (dome lights on) the voltage starts dropping in the hundredths place pretty quickly (12.32, 12.31. 12.30, etc) If I stick the key in and turn the key to the II position (dash now on) the voltage starts to take a nose dive (12.3, 12.2, 12.1, etc) and it will keep falling until I stop it. If I remove the keys and shut the door the voltage goes back up to high 11s low 12s. While idling I am only getting 11.5 volts but it drops quickly into the 10 range. When I turn everything off again it heads back to 12ish. I watched the voltage as I revved up and it was in the 11s until I hit like 3000rpm it jumped to 13 and after i released the gas pedal shot up to 14.3ish where it remained with a little fluctuation. After this the battery light went off. Previous things I noticed before today are that if I were to leave my door open/keys in the battery would die withing 15 minutes. Also when I give the vehicle gas the voltage drops(headlights dim) but when I release the pedal they get super bright almost like getting a boost of voltage. has anyone ever experienced anything like this?