Can the throttle light of a underbone motorcycle be converted to a DC light?
2 Answers
Yes, it can be converted. To change an AC light to a DC light, modifications are needed for the magneto coil, rectifier, and lighting circuit. Conversion method: Disconnect the lighting output wire on the lighting coil and insulate it. Connect the original ground wire to the original lighting output wire head (connected to the vehicle wiring harness, the original lighting wire of the coil is discarded). Then replace with a suitable DC rectifier. Connect the sampling voltage wire of the rectifier to the power wire of the ignition switch, meaning this wire will be powered when the key is turned on. Finally, connect the power wire of the headlight switch to the power wire of the ignition switch, meaning the headlight switch power wire will be powered when the key is turned on. Voltage measurement: Use a multimeter to measure the charging voltage at both ends of the battery. When the light is off and the throttle is increased, the voltage should reach above 14V. When the light is on and the throttle is increased, the voltage should be around 13V, indicating normal operation.
My old underbone motorcycle's headlight was converted from AC to DC, and it's completely doable. The key is to check the original bike's wiring: if the system is AC-powered, you'll need to add a small rectifier module to convert it to DC. Before starting, review the circuit diagram to locate the headlight wiring points, ensuring no loose or poor connections. After the conversion, my light became much more stable with even brightness, and I no longer worry about flickering lights causing trouble at night. However, the modification process requires careful attention—if the voltage doesn't match or the fuse isn't properly installed, it could burn out the bulb or even damage the entire circuit. I recommend keeping a multimeter handy to check the voltage range, ensuring it stays within the safe 12V limit. As a side note, after switching to DC, my battery life also improved, saving me a lot of maintenance hassle. But if you're clueless about electronics, it's safer to find a reliable mechanic.
