trying to reconnect wire terminals and though I had everything fixed. I was wrong.

Will someone please help me figure out what the various blue wires in the main harness are?
 

What is supposed to be part of this sub-harness.  I  assumed that it should be the similarly shaded blue wire to match the wires in the corresponding connector but according to the diagram blue is for the tailight circuit and the light blue is for the "head/meter light circuit and I don't know why either should be paired with the horn wire.
 

For reference:
 

I'd better not confuse thing more than they are--but-- pink is to the horn button & brown powers the horn plus a lot of other things on dc battery power like brake light & i guess neutral light if fitted so maybe not a lot of things. Pink [horn button] earths to the handle bars. Brown /White is from the relay to the flasher switch to then go left & right. Brown powers the flasher relay [talking light brown as compared to dark brown] Dark brown is left flashers front & rear & Dark green is right flasher front & Rear. If there's a flasher indicator light on the dash/tacho it'll have 'that' dark green & dark brown going to each side of the bulb so glows no matter if left or right. That's mostly trawling my old memory plus expanding your pic for a bit of a sneak look just incase. So happy to be pulled up on it [& can't remember what happened yesterday sometimes].

I think I figured some of it out.

#1 meter light
#2 tail light
#3 neutral light

 

Into the double blue female connector should go the single blue males for the speedo and tacho illumination lights.

Amongst the seven (I think!) wires that come from the left switch gear are a pink and a blue. These have no relationship with each other, but are paired in the same black rubber block. The blue male from your left switch should sit in your black connector (your photo indicates this as being vacant).

I think that the blue tail light circuit (DC from the battery) is not linked to the blue headlight circuit (AC from the engine, when running).

Just my thoughts. I think Blue on a CT3 to the tail would be a magneto powered tail light linked to other blues like instrument lights & headlight to the center post of the dip-switch. CT3 just has a small 6 volt battery lucky to do much more than toot & flash & stop light once in a while. Even then its lucky to keep up but had a higher rate of daylight charge to swap over into a double connector under the tank or near the back of the tank. Something like a green into a red/green double connector.

"Just my thoughts. I think Blue on a CT3 to the tail would be a magneto powered tail light linked to other blues like instrument lights & headlight to the center post of the dip-switch. CT3 just has a small 6 volt battery lucky to do much more than toot & flash & stop light once in a while. Even then its lucky to keep up but had a higher rate of daylight charge to swap over into a double connector under the tank or near the back of the tank. Something like a green into a red/green double connector."

If I've read the wiring diagram and main switch legend correctly (not guaranteed!), then the tail light (blue = L) links to the red and to the brown in switch position 2, whilst the headlight (LW) links to the headlight circuit (yellow) in the same switch position. I think that this ties in with my previous post.

Ok, i'll back off & see how it pans out. Be nice to know how she runs in the end.

Just now looking at the switch part of the diagram [which i'd not looked at earlier]--can see what you mean. But with our bikes down here no tail lights are direct off the battery, just off ac with headlight. Except brake light of course is dc.