Mike-
The non-charging system is the system that Porsche graciously included on my 912. It flares up occasionally - like when I'm in the drive through at In-n-Out at 10:30 p.m. and the stereo turns off... or when I'm on a date and a turn of a key causes the solenoid to pop but no engine kickover (damn lucky I parked downhill, just popped it into gear)...
Seriously though, .34 volts sounds really low to me.
Efrain
68 912 Coupe