VeeTwinHonda

Tonight I was riding home from work and I noticed that the headlight ( well actually all of the lights ) on my bike was flickering . It wouldnt change with engine speed but just sort of whenever it felt like it I guess . The lights would go dim for a few seconds and then go back to normal . I put a charging tester on my battery and it shows that the alternator is doing its job . So I am a bit stumped , do the superhawks have a external voltage regulator or something that would be causing this , is this normal or am I loosing my mind ????? Keep in mind that I work on cars constantly and I only dabble in bikes . I let my honda dealer do all the real messy stuff . Any Ideas ???