Did you confirm that your relay is sound?
In the US version of the PDF online Manual, its secton 19-23
I'm having an issue also. My protons worked fine with the rear bulb type signals. But eventially they kind of stopped working. I think my relay is weak or not funtioning. When I hold the relay in my hand and hit the turn button, I feel it click and stutter.
I'm soldering in a resistor at the recomendation of Proton. They say use a sand cast wire wound resistor of 20 watts, 8 ohm. One end to the ground wire, the other to the actual signal wire. That means which ever proton wire is spliced to the solid orange wire (and the solid blue wire for the other side)