V-star 650 won't start and the headlight won't come on. Battery was replaced, new gas put in. now what?

Replace your right switch assembly on the handle bar. Your starter button is dirty or broken and the only way to replace it is to replace the assembly. Your starter button is a two position switch that both turns off the headlight to direct more power to the starter and activates your starter solenoid. Either the right switch assembly has become unplugged from the harness inside the head light bucket or a broken power wire is causing the system to not work. But most likely a dirty or broken starter button is the cause of your problems.