Got a horrible feeling that is what it is - if it were the parasitic draw for a modern car it would be considered really good. I.e. low. 
My standard V100, 15,000 mile. Ridden daily, no accessories fitted, not even a connecting my phone. Also doing mostly long trips, not town duty. Still charging light started to show in colder mornings(Where I live cold is anything below 10Deg Celsius). Also the battery barely had enough CCA to cranck the starter. I made a basic voltage check, and although the values looked reasonable(12.5V with switch on, didnt go below 10 volt when crancking, and around 14V at idle) the problem persisted. I opted to replace my battery, perhaps to early.
Since replaced no issue. Didn’t do any parasitic draw check. Bud did learned 2 things:
- Alternator belt feels loose. Replacement due soon in the service.
- I came across an internal Guzzi service bulletin which instructed dealers to perform an alternator output check.
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Didn’t know it was belt driven so learned something new!
(Thought we got rid of a belt when MG stopped using a dynamo? 
)
Sorry about the delay, i’ve been out of comms for a while. The flashing red light goes off after a bit. Not measured the time but basically if I park it today it won’t be on tomorrow. I’m still in West Africa so cant check it now.