Just what I need going into winter, lol.
I replaced the Alternator about, hmm, a little over 12 months ago and it's been fine, just gave it a quick scan when messing with another mod and comes back with:
==
01117 - Generator Terminal DF Load Signal 
            008 - Implausible Signal - Intermittent
             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 19
                    Mileage: 208781 km
                    Time Indication: 0
             Freeze Frame:
                        ON 
                    Voltage: 12.40 V
                        ON 
                        ON 
                        OFF 
                        OFF 
                        OFF
==
Is this more than likely a bad alternator "again" wiring seems ok and battery isn't too old replaced about the same time as the Alternator.
Starting seems unaffected.