Hi all. Are there any electrical gurus out there? I just had a couple of weeks in France on my Vee (K3) and all was good except that on about day 2 the headlights stopped working. It was not that much of an issue as I wasn't planning on nighttime riding. All bulbs and fuses OK, no other obvious causes either.
The bike is great condition and has had very little wet use ever, and no electrical issues in the 8 years I've owned it. Both main & dip beams stopped working on both lights. Though main works if you use the flasher button, so I think it's obviously not an earth problem. When the headlights stopped working everything else still works fine- engine, rear lights, instrument lights, everything.
Looking at the wiring diagram - see below- I figured that the problem has to be in the power feed to the dimmer switch that I have marked in yellow. Most probably the connector I would suspect. As that connector is under the tank etc I left it alone on my travels, to fix at home. A week later in the trip the lights started working again! No flickering or any sign of a dodgy connection or anything. Then a couple of days later they stopped working again. This repeated again too.
The really mysterious thing is that I noticed that at time when the lights are working the first/fullest bar of the fuel gauge lasts about 80+miles as usual. When the lights aren't working it only lasts maybe 10 miles. Looking at the wiring diagram there is no apparent direct connection with this and the headlights. All ultimately share the same power and earthing, but were those the problem then the headlight flasher shoudln't work either.
All ideas appreciated! I haven't started dismantling the bike yet. It's annoying that to get at the wiring connectors I'm going to have to remove the tank and hence disconnect the fuel gauge sender, as doing that may have an effect on the problem & make it even harder to find....
