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Could be the high/low beam switch as well. Strangely, I have the exact same problem on my Tao cy150 roman as we speak...lol...My hi low beam indicator light on the dash isn't working either in my case, but all other lights work great.  I changed out my VR/Rectifier to no avail. I know it has something to do with that yellow wire....but where? Who knows? I went ahead and ordered a hi lo beam switch for the handlebars.  Hopfully that'll do the trick.

Has anyone ever tried a LED headlamp bulb in a GY6?  A low wattage like a 30w or even a 10w LED for example?  I've been debating on ordering one, because my halogen is really dim.  I'm concerned mainly about how hot the bulb would get in the headlamp housing/reflector.  Anybody ever tried one?

Bingo! The R/R's I had been trying were the wrong ones. I ordered a different R/R that specified "for 150cc", and it solved everything. I guess the R/R's I had ordered before were not for 8 pole stators or something....still not sure on that one...lol.

What is the maximum vdc reading one should get at the battery with engine racing on a gy6 150cc chineese scooter?  I've seen a lot about minimum charging voltage, but I'm hitting nearly 18 vdc.  Is this acceptable, or will it eventually fry my battery?

Hey JR, you da man!! I was about to switch stators, and thought I'd try the new R/R I just got in the mail. Bingo! What's wierd is that its still reading DC at the light socket. Now it doesn't exceed 7 volts when racing the engine. I put a new bulb in, and presto! It glows brilliant white, and doesn't blow the bulb! Of course time will tell for sure, but by George, I think we got 'er! Thanks again bro!<S>

I've been blowing light bulbs in my headlight. I think this started when my stator went bad, and I replaced it with a new one. Since the stator replacement the scooter runs good, but keeps blowing headlight bulbs. When I increase rpm's I can see the headlight get brighter, and as the engine reaches a race, the bulb glows a very bright blue white and quickly blows. I replaced the R/R with one off my wife's scoot, (shhhh...lol), and same thing again. I've made an attempt to use a volt/ohm meter on the headlight receptical, and I can't get a reading on AC voltage, but when I switch to DC voltage it shows about 6v at an idle, and when I race the engine it goes as high as 35v. I thought the headlight was AC, or? Did I wire my new stator in backwards? Is it even possible? This is a 2013 GY6 CY150e Tao Tao Roman with only an air intake/jet modification. Also have performance CDI, (new), and Coil, (also new). I PDI'd the scoot completely over the last year or so, and she was running great until the stator went, and it lost spark. I suspect the exciter coil went. I replaced the stator with an 8 pole stator much like the one that came out. The plug on the new stator wouldn't plug into my wiring harness though, but the wires were all color coded the same, so I spliced the wires together and soldered them, used heat shrink, and taped them well with electrical friction tape. Again...the only issue is blowing headlight bulbs. They are the 35w 12v H4 P43T  type bulbs. Everything else runs on DC....taillight, turn singals, license plate illum., running light in headlight...etc. Any help would be highly appreciated!