Hi give the loom switches and components a good physical going over first look for any loose dirty connections, kinked, trapped or broken wires especially around the steering head where the cables are pushed and pulled every time you turn the bike. then open up the connectors one by one and look for any form of corrosion if nothing found that's obvious it starts getting serious, and if l'm honest, if you not electrical minded it's probably better to find somebody who is. By the time you have brought a meter and then fried your brain learning how to use it, you might wish you had. But first things first give it a good looking over.