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HERE IS WHAT I POSTED ON IT'S THE RIDE BOARDS ON 8/8/16 --
Thanks for the response JR and sorry for the delay in getting back to you. I was away on vacation for a while (sadly with no scoot) and it took a while to do some testing and find the problem. All battery tests checked out good. After removing all the body panels I finally found the culprit to be a single bent contact pin in the disconnect plug on the regulator/rectifier. It had been arcing until it stopped making connection so I had to cut that particular wire out of the disconnect plug and reconnect them together outside of the plug and....VOILA! the lights worked perfectly. I rode it for a couple of days (during the daytime) with no apparent problems, but the first night I rode it a new problem arose. Low beam headlights worked perfectly and Hi beam worked fine whenever I needed to turn them on but after a 20 mile run of all AOK a mile before home, the Hi beams started flashing erratically when I turned them on so I rode the rest of the way home with just the Lo beams on. Results of testing the next day: Lo beam headlights and all other lights work perfectly but Hi beam wouldn't come on at all. However - the longer I sat there with the motor running and continuing to turn on the Hi beam it would begin flashing but the longer I ran the motor and/or revved up the motor the Hi beams would come on NORMALLY. It's almost like it's not generating enough power for the extra amps for the extra draw of the Hi beams, yet ALL other electrical components work perfectly.....including engine starting instantly. I could find no loose connections anywhere in the lighting circuit. Does this sound like a problem with the regulator/rectifier, or is there anyone else out there that has had this problem? I can run fine and legally during the daytime because the regular lights work fine, but have refrained from riding at night because of this quirky problem with the Hi beams and am missing some great summer night rides!! Thanks for any help you can give.

Read more: itistheride.boards.net/thread/9562/headlights-tail#ixzz4HelFLeNe

I have been tracing the wiring with the diagram and haven't found any breaks and all connection plugs seem secure. I will recheck the connectors and will test the diodes in the rectifier and let you all know how I make out. Thanks for the input.

I know that the tail & head lights won't work unless the motor is running and I'm thinking what ever senses that the motor is running to tell the lights it's ok to come on is the problem. Neither the low or high beams come on and no tail lights. However, the high beams come on with the flasher switch and all directional and brake lights work fine with or without the motor running. All bulbs are good and I checked for loose plug connections in the wiring harness and all check out fine. What is it that supplies the power for the head lights only when the motor is running. Is it the regulator/rectifier and if so could that be the problem? My scoot is a 2007 Lance Grand Touring P-250 made by BENZHOU,which is essentially the same as a Roketa MC-54B-250 with the Linhai motor.

Thanks for any help you can give me.

Thanks Alleyoop and Cruiser. I've been extra busy for a while and haven't been able to follow thru with your suggestions but I will. I did find the rubber "o-ring" on the auto choke broken and maybe leaking air and I put a temporary gasket in place of it until I can find a new o-ring and the bike runs much better now but haven't run it long enough to see if it will never stall each time I stop. It did stall once during a test of a dozen starts and stops so will replace gasket with a correct rubber o-ring and let you all know if that solved the prob. Will otherwise check out your suggestions.
I do have a new problem however. Starts great with a fully charged battery (12.75V) but after riding to do a few errands and a few miles of shutting off and restarting the motor without any obvious sluggishness of the starter all in the same day it will finally not start (as in dead battery). If I immediately check the voltage it reads more than 12V with key off but when I go to crank it the voltage drops to 3-4V. If I immediately substitute another fully charged battery it starts like gang busters. When the motor is running I read a charging voltage of about 13.75V at about 3000 rpm. What do you all think about this dilemma. Sorry to ramble on.