How to eliminate the constant illumination of the motorcycle malfunction indicator light?
2 Answers
First, inspect the connection from the generator's excitation winding lead through the brushes to the regulator. Recheck the connections of the three-phase winding leads through the diodes, neutral point to the regulator, then inspect the wiring of the indicator light, switch, regulator, and battery. When confirming a regulator fault, first identify the issue, typically starting with checking whether the contacts are burnt, dirty, or not conducting, and if the contact return spring has failed.
Last time my motorcycle's warning light stayed on constantly, the experienced mechanic taught me to check step by step. Don't rush to reset the light—just like with a fever, you need to find the root cause first. For mechanical parts, check if the engine oil is sufficient and whether the air filter is clogged—older bikes are particularly prone to dust buildup. For the electrical system, inspect if any fuses are blown—focus on that 15A small glass tube labeled 'FUSE' in the black box under the seat. Don’t randomly try jumpers on the diagnostic port; beginners should use an OBD Bluetooth module connected to their phone for safety. If you just filled up with low-quality fuel, draining the tank and cleaning the injectors might solve the problem. If all else fails, take it to a professional shop—their scanners can read the exact fault code location, which is much better than guessing blindly.
