Where does the needle on your battery gauge sit? Mine sits between the O and the R but more on the R. I have a brand new battery, I had the alternator tested and its putting out 13.51V. For some strange reason though i dont think thats where its supposed to sit. Maybe my alt is going bad?

 

Very Simple
Just get a portable voltmeter ($5 at harbor freight)
Start Car put dc volts across battery terminal.
Read voltage. Should be around 14 volts.
Look at instrument gauge. This is where it should
be when car is charging.

Put on headlites and fan on max
Read volotmeter, look at gauge this is
probably where it is not charging unless
you have a hell of a big alternator.