Hey, nice suggestion, nxrs20. I'll check if the steering has any effect on the switch. It is now removed from the handle bar. I'll move it arround an look for false contacts.

I've also looked at the wiring diagram. I can see that the kill switch (2 wires) and the front stop switch (2 wires) join in a "4P mini red". But where is this connector located? It has to be close... Where is the "wiring box"?

Always learning.