How to Determine if a Motorcycle Relay is Faulty?
2 Answers
Dim or non-functional headlights. The motorcycle cannot be started using electric ignition. Check for voltage changes. If the voltage remains unchanged as the engine speed increases, it is normal. Engine starting. If the positive terminal of the battery is disconnected and the circuit voltage exceeds 14.5 volts, or even reaches above 18 volts, the rectifier is faulty.
I've been riding motorcycles for years and often encounter relay failures. The main methods for diagnosis involve observing symptoms and conducting simple tests. If the bike doesn't respond or makes weak sounds when starting, but the battery has sufficient charge, the relay might be faulty. Try listening for sounds: a normal relay will produce a distinct click when starting; if there's no sound or just a single click without movement, that indicates a problem. You can use a multimeter to measure it yourself - the coil resistance should be between 20-50 ohms; infinite resistance or zero means it's damaged. Also check the relay's appearance for burn marks or loose wiring. Remember that relays affect the starter motor - safety first. If there's an issue, stop immediately for repairs to avoid being stranded on the road. Regular maintenance includes cleaning contacts to prevent corrosion, which can extend its lifespan. Replacement isn't expensive - choose reliable brands to ensure stability.
