You don't need a regulator. All 12v devices (including your factory brake light bulbs!) are spec'd to handle up to 15v so it'll handle anything your bike can dish out. You might notice them dim a bit if you have your highbeams on and your fan comes on, but other than that, they'd be rock solid.Thanks Jamie. I'm still going to look for a 12V regulator though if I can..not sure how the current brake lights modulate voltage fluctuations but they must somehow right? Do I only need a regulator if I'm connecting directly to the battery?
-Jamie M.