After being overseas for 6 months, the battery went dead in my Porsche, took 2 days of charging to get power back into it. Started up and noticed it was charging right about 13V.

So I bought a Optima battery and put it in, thinking the old battery had a dead cell or something... Still only charging at 12.5-13.0V

So I bought a re-manufactured Bosch Alternator and installed it...

Same issue but now slightly worse, with a new battery and alternator the car is only charging 12-12.5V...

I live in Arizona so I dont see how the cables could be corroded but that is the only thing that is left...

Anyone else have charging issues?

 

Nope. But I have to ask - Why are you dumping money into the car before having it checked out at the dealership (or your Indi.)?