Welcome to HDTimeline, you will find a large pool of experience and knowledge to help you to make your riding experience enjoyable. There are a number of things to try, but first I would check the fuse box...it is open to weathering and corrosion can cause intermittant problems. Use contact cleaner and clean or replace the fuses (plugging and unplugging should be fine) and the relay. Also check all 6 primary cable connections (neutralize with baking soda and scrape w/ pocket knife) Red, Black & Starter cable.
Sometimes what DOES work can help troubleshooting...do the turn signals works, are there any diagnostic codes that flash on the speedo display, is your bike equipped with immobilizer? Was there recent controls or electrical work done near the engine kill switch, tail light or main harness or added accessories...peripheral damage may have been done. Yep, a lot of stuff can be done yourself, but the real big thing is, do you have a MOCO Service Manual...it is worth it's weight in gold right now...