The rectifier of three-wheeled motorcycle is basically the same as that of two-wheeled motorcycle, except that some may be three-phase or single-phase. Generally, two (three) yellow lines are AC input lines, red is output positive pole, green is output negative pole (ground), black is feedback line, and it is an AC converter. Conversion power supply into direct current only, because the electricity from the magneto is generally AC, while motorcycle batteries are DC, need to be converted, conditional use of a multimeter to measure the voltage will know the good or bad.
1. If there is no multimeter, remove the battery positive pole, then step on the starting pole car with your foot to see if there is electricity (for example, you can observe the neutral light on the instrument and so on). If there is a case, try to ignite the car to see if the voltage is normal (you can increase the throttle, see if the intensity of the light changes), if it is too intense burning. If the lamp is too weak, it means that the rectifier has a problem, but generally only for carburetor cars.
2. You can also remove the fuse in case of landing to see if the lamp (horn) will turn on (ring). If the rectifier is charging, otherwise it will not charge.
3. Start the car, remove the battery negative wire, touch the battery negative ear piece with the removed wire. If there is a slight spark, the rectifier is normal. If there is no spark, the rectifier will be broken.
4. If there is a multimeter, 14.4-14.6V can be easily measured online, which is normal; about 12V indicates that the rectifier is faulty. Because the rectifier has voltage stabilization function, with the increase of speed, the voltage will not change to normal, that is to say, whether you are driving or idling, as long as the speed goes up, the voltage will not increase with the speed, that is normal.
5. If you want to make a further accurate judgement, you can disconnect the battery charging line, replace the battery with a 50V/1000 UF capacitor, start the engine, monitor the voltage with a multimeter, gradually increase the speed, and keep the voltage at more than 14V, which means that the rectifier is good. If the voltage is very low, below 13V or climbs with the speed, then it is bad. Be sure to disconnect the battery, otherwise the voltage will be forced down by the battery, giving you the illusion that the voltage is normal, and the consequence is that the battery overcharge will be reimbursed in advance. Must connect capacitors, because the rectifier comes out of the unfiltered pulsating voltage, neither AC nor DC, the multimeter DC voltage can not be correctly identified, as there are 10 V idle speed, speed increases into 3-4 V or even no voltage.