Gary is right. I might add. Our generators are rated 32 Amps at 5,000 RPM. At lower RPM that number goes down. So at 2,500 RPM it is likely you only have half this available. The stock lights and the engine pull somewhere aournd 8 to 10 amps. You may be useing more power than your generator is making. Discharging your battery as you ride.
So don't try to use to many accessories. If you have passing lamps turn them off when using heated cloths for example. Try to keep your engine speed up. Don't try to ride at a slow engine speed. Use a gear that keeps the RPM up a little.
Be sure the battery is nearly charged when making the checks Gary talked about. You might also try checking same with your cloths plugged in.