I have a 2000 yamaha roadstar xvt 1600 Silverado edition. I was wiring up a new backlight and I had the power on without the bike running and totally forgot about all my other lights being on. The battery went dead I charged it and after it charged I started the bike but I noticed none of my lights were on and whenever I went to throttle it it wanted to stall and it made a funny sound like muffled air when that happened. So I went and got a new battery because I just bought this bike in march and dint know how old it was. And that wasn't the problem. I tested the battery it reads 13v and when I start it it goes to 15.25. On and my signals still work my radio does not and I have a hyper charger that had lights on it as well and they dont work. 

I would check the fuses,,,,  As you were at new light, with power On,,