Kalle wrote: so maybe the problem is in the switch?

Poupy wrote:You mean you have the tail light on with the light switch off? Abnormal. The only positive news about that is that the bulb is functional  

According to what you say, only the front parking light (not the tail light) works when the light switch is set to on. Do you confirm? For memory, the parking lights - front and tail - are activated by a specific position of the ignition key, beyond the steering locking position, i.e. when the main power is off. Is that what you mean when you mention parking light?

Studying what you state, my suspiscion is towards the ignition key switch. Do you still use the original one, with its special internal connections?

Poupy wrote:In your first message you state that the low beam, then the high one started to misfunction. That is typical of a left hand switch problem, as the low and high beams use the same feeding wire, white/yellow, coming from the right hand switch.
Usually, when neither the low or high beams work, the "flasher" is still operational. That is because it uses a specific circuit. For being sure, check that flasher operation on your bike, to exclude the basic blown bulb problem.

Anyway, in addition to that LH switch likely problem, there is something else as your tail light behaviour is strange. It seems to act independently from the front position light. And when it works is when it should not.
Is your tail light of the original type or did you change it for a LEDs one? The rear bulbs electronic control device bahaviour is based on actual electrical consumption. Cheating it can imply unexpected behaviour.

Kalle wrote:

Poupy wrote:In your first message you state that the low beam, then the high one started to misfunction. That is typical of a left hand switch problem, as the low and high beams use the same feeding wire, white/yellow, coming from the right hand switch.
Usually, when neither the low or high beams work, the "flasher" is still operational. That is because it uses a specific circuit. For being sure, check that flasher operation on your bike, to exclude the basic blown bulb problem.

Anyway, in addition to that LH switch likely problem, there is something else as your tail light behaviour is strange. It seems to act independently from the front position light. And when it works is when it should not.
Is your tail light of the original type or did you change it for a LEDs one? The rear bulbs electronic control device bahaviour is based on actual electrical consumption. Cheating it can imply unexpected behaviour.

The tail light is LED. I'll put in a new headlight bulb and check the flasher function, and also start it up to see if it makes it behave differently

Stumpy wrote:

Kalle wrote:

Poupy wrote:In your first message you state that the low beam, then the high one started to misfunction. That is typical of a left hand switch problem, as the low and high beams use the same feeding wire, white/yellow, coming from the right hand switch.
Usually, when neither the low or high beams work, the "flasher" is still operational. That is because it uses a specific circuit. For being sure, check that flasher operation on your bike, to exclude the basic blown bulb problem.

Anyway, in addition to that LH switch likely problem, there is something else as your tail light behaviour is strange. It seems to act independently from the front position light. And when it works is when it should not.
Is your tail light of the original type or did you change it for a LEDs one? The rear bulbs electronic control device bahaviour is based on actual electrical consumption. Cheating it can imply unexpected behaviour.

The tail light is LED. I'll put in a new headlight bulb and check the flasher function, and also start it up to see if it makes it behave differently

If your tail light is led, swap the wires, I had a sidelight that worked until I put in an LED. I switched the positive and earth wires and the LED worked.

Thanks! Worked a charm!