Over voltage.... or not?

False alarm. :)
I tested my battery with the engine running : 14.7 volts (engine shutted off : 13.6V).
In fact, it's my in-board voltmeter which is'nt very accurate. Instead of 14.7V, it reads 15+.
Poorly calibrated Chinese product :rolleyes:

And effectively, the voltage drops with headlights : 14.1 volts.
I think my regulator is doing his job properly

François