Battery V at idle (1400-1500) is 14.30V

Battery V at 3000 is 14.33V


I have just realised something, the pulsing problem I have only seen when the engine is off as I can't see the light when on the bike obviously. I just tried it with the engine running, and at idle you could see it pulsing a little bit, (although it is so little it could just be my eyes playing tricks, I have been looking at flashing indicator lights for ages lol), and then with some revs you can't see it pulsing, the light gets a bit brighter anyway.

I don't understand why this is the case that it pulses when engine off but not when running?