Thanks for your input!
In the meantime I encountered the same problems as Valen described
I relied on Energica's specs for the LED i.e. a bit less than 2 Watt per indicator and purchased sequential LEDs originally for a Triumph, but they are made by Koso, so it's not cheap crap I try to put on the bike. Koso usually has no LEDs beyond the 2 Watt, so I did not expect any issues.
But now, installing the right front one first, they flash once then the error #B1007 comes up (right indicator circuit fault).
Tried several things, e.g. switching a 70 Ohm resistor in parallel, but then the indicator not even flashes once (though the fault is not coming up).
Another try was to connect both indicators, the original as well as the new one in parallel, but with the same result, both flash once, then error code.
I measured the original Energica LED, but according to the multimeter the resistance is > 2 MegaOhm (!)
According to the Energica specs, at 13.5 V and 1,89 W I calculate the restistance to approx. 100 Ohm. Unfortunately I am not Electrician enough to understand this.
The new LED has 100 KiloOhm, which is surprising as well.
Googling this does not really help me any further, everything I found there is about the conversion from incandescent to LED.
Do I miss something elementary here?
@Valen, did you find a fix for this?
@MoneyFor: Were you just lucky or what did you do to make them work?