But Headlight glows on AC. When u see, u'll find yellow color wire connected to the regulator, that is going to the headlight too, that has been grounded inside the regulator/rectifier to regulate the power. Rest of the power dissipate as heat.
If u remove this wire, regulator will have no control on volts going to the headlight, in low rpm nothing will happen, but when u increase the rpm a lot i.e, go beyond the headlight specification the bulb will fuse.
So, u can check how much volts is being regulated using multimeter. It should be 12.5-13v. I dont think regulator can gone bad. If u want to increase light intensity u can do that without replacing the regulator.
You can use the resistor from 470 ohms all the way up to 1k in between regulator & yellow wire. 1k resistance will give higher volts and may blacken the bulb. But u are safe to use up to 680 ohms. But i would recommend try 600 ohms. This will increase your light intensity. Try it!
Edit: Also change all console bulbs to led which runs on AC along with headlight. Also change the back light to led. If u wanna try remove the wire going to the back light and see the increment








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