I have a weird problem with my lights. If I run with the top switch in the first right position (i.e. no headlights), everything works great, turn signals, dash lights etc. When I switch it to the far right (turning on the headlights) it will work for a while and then (seemingly randomly) I will lose all of my lights, including headlights, turn signals, dash, etc.

Eventually, they will come back on and it seems to help if I turn the top switch completely off (the straight vertical position) and then back on again. Also, this all happens when I'm running down the road, I haven't tested it sitting still yet.

The 3-way switch is obviously one thing to check, but what other things should I look at? Are there any common problems with the lighting system. When all the lights are on, they all work great. There's no flickering or dimming, they just disappear all of a sudden.