That could explain why the tail light bulb didn't blow lol. Still trying to find some instructions on where/how to install this 6v regulator. Treats has a very general "tutorial" on the product description, but I found a video on YouTube that may have guided me. Looks like I can hook the regulator up to yellow wire from stator (headlight and tail lights) and the green/yellow (brake light) to have my bulbs running on regulated current? Or do I hook up the regulator to the yellow (as above) and the red (brake switches)? My guess is the latter as this would supply regulation to the whole lighting circuit. I could combine both the yellow and red wires to the input on the regulator and then combine to the output as well on the other end?