2008 TRX250ex won’t start

I have a 2008 TRX250ex. When I turn the key the headlights come on but the neutral light doesn’t come on when in reverse. Start button doesn’t work, no power. Will tuen over if shorted at relay. New battery, new relay, new rectifier and new control module. Going to replace start button on handle bars next. Is it an electrical issue? Where should I start. It’s not recognizing neutral I guess. Just at a total loss for where to begin. Thanks in advance.