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headlight beam not working

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wannabay:
Morning.
Bryanj, Yes you are correct re handlebar switch configuration.
Am thinking that voltage drop to 8.7 at the bulb itself means that insufficient power can be carried to the bulb and so it won't light up.
As voltage on side light is higher at 10v and this comes from lights switch, which also controls main light, it's looking like the dip high switch is the culprit
I'll check voltage drop around lighting circuit later, shopping trip intervenes, and report back
Gerry

Bryanj:
Even at 6v it would glow, there is a wire from the RH switch that goes via the headlamp bucket to the dip switch. check that it is connected OK

wannabay:
After all that it was a rogue headlight fuse!
There was a 1.5 voltage drop across the fuse holder. I swapped in a new fuse and hey presto no voltage drop and everything works!
No idea what/why but I do have working dip/main beam now.
Also found a dud earth connection to backlight in speedo so need to sort that too - I can see a similar repair has been done to tachometer as the wrong colour wire has been used.
At least I now know my way around the wiring loom
Cheers all
Gerry

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