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150cc scooters often run headlights as DC straight from the regulator. When you turn on the ignition but have the engine off do your headlights work? Or do you have to press the brake then they work? Also when you press the brakes do your brake lights work normally?
If you press both brakes does it go dim again? Without diagnosing this problem, constantly replacing regulators will do you no good. I'm betting the problem is miswired lighting. Wouldn't be the first time this happened.
Try unplugging both brake switch wires. Then connect them one at a time normally to see if any of those are causing problems.
If not then I would remove every external light bulb but the headlights. That means turn signals and brake lights.
If you unplug the turn signals and brake lights you're isolating the head lights from possible wiring problems from the brake lights which should show up as normal running headlights.
Also post a picture of the rectifier, we need to know what type of rectifier this is, 5 wire or 6 wire it might be able to tell us of the plug has been miswired.
Because the above diagram looks more like a 4 wire 50cc wiring diagram. The 150cc often has 5 or 6 wire regulators.
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