XJ 900f power/switch - error / shortbrake

Power / ignition error - XJ 900F
While turning the key - the power goes "in black" - the watch/display dies.

I got the problem a while a go - and first the error came as i pressed the start-button.
(by then the green "neutral" -light + watch was ok - but died as i pressed the button)

Next step was as i turned the key/switch - then everything was "black"

I talked to the dealer and they asked me to measure the start/run/stop-buttons.
They seems ok.
Then I checked the turning-switch (3 positions - left, "neutral" and right )
When cheking this switch we used the multimeter to check if it sent power through (noise - as if you put both needles together on the multimeter).
On the turning-light-switch - it was buzzing on all 3 positions.. is this normal?

Else - do you have any idea how to solve this issue?

Any cable/wiring-forms?

Something to do with fuses?

 

wiring diagram down load
http://www.classiccycles.org/media//DIR_1516204/DIR_1596304/6b8579a7ef4aa946ffff8464ffffe41e.pdf

start by cleaning the battery , motor and frame ground connections
check your fuse connections

 

Thanx! I'll try tomorrow!!

 

Case closed!
It was the cable to the negative-pole on the battery that were loose.

Alles gut! Thanx everyone!

 

it is always nice when it is something simple