Yamaha XJ 550 4V8 Trouble Starting Motorcycle (Philipp's ongoing troubleshoot)

Guys I'm currently working on the indicator problem, and I noticed that there's a thread without any wire connected to it.
Do you guys know if there's something supposed to be connected to the second most left connector, so the one just below the red line?

https://www.directupload.net/file/d/5812/bo6vxmuh_jpg.htm

Also, what wires would I have to hotwire in order for the oil light to come on?

 

Little update:
I figured out all the indicators, so that's working.

I've got a new problem now:
Suddenly, while the bike is running, the battery has a voltage of only 12,2V. When accelerating, the voltage goes up to the 13-14 Volt (but not above 14,5V) and the light gets brighter, but when it's decelerating it goes back down to 12,2V.
Afaik, that wasn't the case yesterday.

What do you guys think?

 

Fyi, here's a little video about what I mean. I'm sorry if you have trouble seeing the voltmeter, I had to do that all by myself.

 

Accelerating or decelerating shouldn't make a difference. 12.2V at idle sounds OK. 13 to 14 above 2500RPM or so, is OK.

 

So this is all ok?
Huh okay, thanks for clearing that up for me. I was under the impression that the little voltmeter in the bike dash used to show 13-14 V while idling.

Still, is it normal that the brightness of the headlight changes depending on the rpm?

 

the oil light comes on when the oil level switch goes low and switches connecting the ground. or when the blue/white wire for starter button makes ground when button is pushed

so if you add a ground to the oil switch wire light will come on
if you press starter button light will come on.

 

You should be able to see if it is off centre by the markers and text on the tyre.. I spoke to a mech yesterday who suggested deflate and thoroughly soap tyre walls/rims. the inflate high (70-80 psi (5 bar)) then reduce to normal pressure of course. Not tried this myself!

 

That's interesting, I might try that. What do you mean by soaping tyre walls/rims? Like, lube them so it's all sliding into place when inflating?

 

I use my caliper to measure from end of frame to end of chain adjuster. measure on both sides untill even . I use the part that slides out from the arm and the end of the arm

 

yes

 

Special soap/lube is available but dishes liquid will do, some say it contains salt which can corrode but Im not sure how true that is.