high beam : hi/lo trigger does work but black switch doesn't...

[Froggymanny]

Hi everyone,
Yet another headlight related topic but different from Markell54's.

I noticed the strangest thing after changing my front bulbs for LED versions...
- right one is fine apparently (always on, no high beam)
- left one is off by default
But...
- if I pull the high beam trigger (left index), left bulb switches to high beam
- if I move the hi/lo beam switch (large black one)... nothing happens...

Anyone would have any hypothesis I could investigate ?
One thing I must admit - I did not (yet) try to put the original bulb back on to check if that solves the issue....

Thanks for your help!

[keithriley]

I would try what you suggested towards the end of your post first, I can't think how an LED would change anything, but you never know

[Art]

If the main (hi) beam bulb works on one switch it should work on the other too because all the wiring is common to both switches (check the wiring diagram) the trickery that makes it work from two switches is the mechanical switch gear inside the switch cluster. Open the handlebar switch up to inspect and clean the internals. Assuming nothing is broken inside the switch remove any obvious debris or corrosion with a pick and emery board (nail file) spray with a maintenance fluid while operating both switches this gets the fluid to parts it may not otherwise reach, next spray with brake cleaner again operating the switch and test. If all's well pack with white silicone grease, check you haven't blocked the drain holes and re-assemble.