Curvy headlights not working

My headlights stopped working a couple of weeks ago, fuses and bulbs are fine. Low beam and high beam not working. Sidelight works and turns off when switch is turned off.

Removed fairing, checked both connectors on both sides no visible damage to either, but doused in wd40 anyway. Checked them both with a multimeter and both appear to be ok.

Next step is to start running a separate cable from fuse box to bypass cabling.

Any other suggestions?

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[sev]

i would check your wiring and switches before bodging and bypassing the wiring loom.

[andrewsmith]

Firstly strip and clean the switch gears they take a hammering.
It was the cause of mine and its been fine since. Use ACF 50 after they are clean and it shouldn't happen again

I kinda ruled out the switch gear since it was working for the sidelight. I'll strip it today!

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[andrewsmith]

Originally Posted by a_monkey_hint

I kinda ruled out the switch gear since it was working for the sidelight. I'll strip it today!

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I lost all lights on an unlit single carriageway doing 90, its not nice having to punch the switchgear to fix it

sent from a weapon of mass distraction

same happened to my sv , check connecter under the front nose cone , right hand side , I cleaned all bits there and its worked ever since , hope that might help

Took apart the right switchgear today. Looked in quite good condition. Totally stripped, cleaned and put back together and its still not working.

On lights off switch everything is off as expected. On side lights switch dash lights come and and sidelight, when clicking to dipped beam, I still get dash lights & side lights but no dipped beam. I'm now stumped!

[andrewsmith]

Dirty connections on the bulbs.

[Sid Squid]

Basics first; bulbs and fuses checked good?
Assuming yes, then as you've dismantled it, you will have noticed that the headlight switch is two pole and there are two supplies to the switch, supplied and fused separately.
Clearly one pole is supplied and is switching correctly, (the one that supplies the tail, position and clock lights), and one may not be.

As both low and high beam do not work, and, if I understand you correctly, everything else does, then the fault is overwhelmingly likely to be in the parts of the lighting system common to both high and low beam, the relevant circuit is;

Orange wire from loom to right hand switch multipin plug - right hand switch multipin plug male/female connectors - orange & red wire from multipin plug to headlight switch - switch - yellow & white wire from switch to right hand switch multipin plug - relevant right hand switch multipin plug male/female connectors - yellow & white wire from right hand switch multipin plug to left hand switch multipin plug - relevant left hand switch multipin plug male/female connectors - yellow/white wire from said multipin plug to dip switch - dip switch.

Note on the right hand switch plug the supply wire is orange on the loom side of the plug and orange/red on the switch side

Check for voltage at each point along that line, if you don't have a meter a bulb with leads on it will work fine, put the wire from the bulb's body on a suitable clean point on the frame or preferably the battery negative terminal, the other wire is your test point, touch it on to the relevant points of the circuit as outlined above, if it lights you have voltage. Regularly check your tester back at the battery positive to avoid errors.

Thanks for the advice everyone!

I've checked nearly every connection with a multimeter, but I'm unable to get a reading anywhere on the loom for the headlights! Even at the fusebox without the fuse in I get nothing (although I suspect the fusebox is at the end of the loom)!

I'm going to fit a bypass hopefully this weekend straight from bibio's distribution relay to my bulbs so they turn on whenever I turn my ignition on. It doesn't help that the previous owner has hacked the loom to bits so its covered in electrical tape and dodgy connections. The rear indicators a prime example where he's fitted aftermarkets ones and the wiring is a mess! I can't tell what is standard and what is his dodgy work!

Other than looking for an auto electrician or start replacing my loom I'm out of ideas.