Wow, you lost your horn, turn signal lights and highbeam at the same time?
Just like I ask my kids, "Where to you remember see them last?"
Ha, ha...OK...First, you need to determine if you have 12v to those electrical users with a multi-tester, I hope you didn"t lose that too.
You probably have a loose connector or a new ground somewhere.
Pull off the seat and the gas tank and start testing the voltage in the connectors.
I hope you find your stuff.