Manny,
A good battery should read 12.6v after removal of residual charge. After charging battery fully, the rule of thumb used to be leave headlights on for 2 minutes to remove residual charge then check, but that was when they had standard 55w bulbs - not sure what load halogen or LED would give though.
If <12.2v, you need a new one, if >12.2v and <12.6v, try a bit of discharge and then fully charge again, then do check as above, but in reality in 99% of cases with modern batteries, it will be dead.
You would be amazed at the spurious messages I used to get out of my Jags when battery was on the way out.
With c. 14v charging voltage, sounds like your charging circuit is good though.
Mark.
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Current Car:
2018 BMW 740d xDrive M Sport with lots of options
Previous cars:
2015 A8 D4 FL 3.0tdi SE Exec LWB with some options
2012 A8 D4 3.0tdi SE Exec LWB with some options
2009 A8 D3 3.0tdi SE not many options but Viezu mapped to 292bhp
2005 XJ 4.2 V8 Petrol Sovereign LWB with lots of options
2000 XJ 4.0 V8 Petrol Sovereign LWB not many options
+ lots of Fords and Volvo
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