Simple facts:

I replaced the cold air intake, cleaned the MAF with MAF sensor cleaner, replaced EGR Valve, and forgot to reconnect the MAF sensor for 1 day. The next day after I caught my oversight, I took the battery cable off to reset codes, etc. and reconnected MAF plug and battery connections..... Then.....

Next day I get Battery light :-( I had 10 month old upgraded alternator and 1 year old battery.

So check everything and alternator tests bad, battery tested good, so I replaced alternator.

Battery light still on. So I recheck battery it tests bad just 2 days after testing good!

Replace battery, and battery light is still on.

Go to Autozone to test alternator and battery again, everything checks out ok, so I asked them to check the OBDII codes, and MY OBDII plug has NO power to it!

So I have a battery light and no power to OBDII plug, all fuses looked ok, and battery/alternator are testing ok.....