Charging Issue

[ReynoldsBp51]

Recently took a trip south to Alabama, and Florida, then returned home to WI. I saw 2 instances in flight where the JPI 830 indicated battery level was at 12 volts, not the normal 13-14. Both times it only lasted for a minute or 2. Pulled the data from the 830 and have attached the screen shots.
My A&P and I will do some testing to see if we can determine if it is the alternator or the voltage regulator.

I'm just looking to see if anyone else has had this experience and what was found. Also open to opinions and suggestions.

 

[Ray93J]

 

[Tweety]

 

[jruhnke]

 

[reb]

 

[ReynoldsBp51]

 

[Reece]

 

[ReynoldsBp51]

 

[oasis0440]

 

[flyguydon]