I have a kymco sector and all of the electrics have gone and I'm not sure on where the fuses are or where the problem is

https://www.manualslib.com/manual/1838669/Kymco-Mxu-450i.html this service manual can assist with troubleshooting electrical system --get a meter and start checking fuses- wiring -switches and components

They are usually an inline fuse on the wire behind it.

You could ask them direct, or google
make model manual
or
make model wiring diagram
or
make model accessory socket fuse

https://www.kymcohealthcare.com/?q=products

I did find this which has the answer!

12v power outlet fuse - KymcoForum.com

https://www.kymcoforum.com > ...

Mar. 5, 2016 - KymcoForum.com »; Scooters - 125 to 300 »; Downtown 300 »; 12v power outlet fuse ... I blew the fuse in the 12v power outlet so have taken off the front to change it. ... Hello zenith9, you're right, that is the fuse holder, I think it is a 'push together and turn anti ... '11 Kymco Downtown 300i ABS - 79,500km
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your best try is to contact your dealer, and get them to order you the short red wire that runs from the + terminal on the battery, to the starter soleniod ( also has a thin red wire that runs to fuse holder) i had exactly the same problem and this solved it. i have however re done all the electrical connections on my bike using 7amp wire and bullet connectors, as i have had many faults with the electrics before.
My bike is a Kymco Cruiser 125 (almost exactly the same bike, i use kymco zing parts when replacing) i paid approx £16 GBP for the wire.