Help Me, I'm An Idiot!

From the photo it looks more like a plated bolt than brass but that’ll make no difference in fairness.

You can visually check the fuses and most likely you will have a spare in the fuse box (my 2013 Tiger has a spare for each rating in the fuse box).

You may have inadvertently touched the live to the bike and caused a short.

 

You really are having a bad day!

I'm not at all familiar with your bike but, if you look at the image you posted, on the far left hand side about half way down that picture is what looks, to me, like a fuse box. The number 2 fuse looks like it has the battery symbol and is, I think, marked 15A? I'm guessing that is likely to be a very good place to start - but probably worth poppping down to your local auto parts store and getting a few spares in before starting the job. Especially if you were a boy scout in your early years.

No judgement here - could happen to anyone - just hope you get it sorted!!

 

Your main fuse should be attached to the live terminal wire and often gets overlooked as everyone goes straight to the fusebox, that would be the first one I would check

 

Check the main fuse, its a 30A one and it's NOT in the main fuse box.
It's located with the starter solenoid and usually there is a spare fuse. You will have to take the side panel off to find it and I am pretty sure that it's the side panel nearest to the positive battery terminal. Best of luck! Don't think you're an idiot we have all dropped things down in the depths. I too find that as I get older small screws and bolts tend to find their way into the depths of the bodywork. I recently installed a gear position indicator on my bike and the unit is held in place with an M4 grubscrew about 5mm long - and yes you've guessed it! That now lives somewhere in the bowels of the wiring loom and hasn't seen the light of day for months!!

One final point - yes the battery bolt is M6 and about 10mm long

 

Agree @Helmut Visor, but what you are pointing to I believe to be the inline fuse of the optimate lead.
Daft question @learningtofly the live terminal has been reconnected hasn’t it (and it’s just masked by the red rubber cover)?

 

Remove the Optimate lead and try again.

 

I'd remove the battery and try to find the missing bolt in case it is the replacement causing the trouble. When you come to reinstall it might be essier if you thread the bolt through the hole in the lead(s) first then with one hand guide the leads and with the other have a philips screwdriver in the end of the bolt you can then push the end of the bolt to the battery post, and once it nakrs contact turn the screwdriver to start the thread.

 

Don't overthink it. The replacement bolt you've used will be fine IMO, it's just a bolt. If it's the correct length and thread it'll be OK. Reading the procedure you followed, if you've blown a fuse it would be when you reconnected the earth terminal and you would've seen sparks at the terminal, certainly with a 30A fuse. I doubt the lost bolt could short out a live terminal as they are all insulated.
Check you haven't disturbed a plug or connector, particularly those in the ECU next to the battery.

 

As long as the positive and negative cable terminals are in hard contact with the correct battery terminals the circuit will be sound (the set screw material will not make a difference). Shame you are so far away as this should be fixable without throwing money at a dealer.

 

I agree the live terminal does not appear to be connected? Yes the Optimate cable is connected but is the live terminal lurking disconnected under the red boot?

 

Hmmmm, a good call but surely not!?

 

Result, and without any expensive dealer involvement

 

No comment.