What is the ampere rating of a motorcycle fuse?
2 Answers
Fuses are available in 10A, 15A, and 20A ratings, as specified in the original vehicle manual. Here is relevant information: 1. When measuring charging voltage, the battery should be installed on the vehicle. Start the engine and increase the throttle. For vehicles with half-wave rectification, the charging voltage should be around 13.5V, while for full-wave or three-phase rectified DC types, the charging voltage should exceed 14V. Otherwise, the charging is insufficient. If the fuse is disconnected during measurement, the rectifier will assume there is no battery in the circuit and limit its output to protect electrical components, resulting in a measurement of around 6V. 2. If the vehicle is used infrequently, the battery may remain in a discharged state, which can damage its lifespan over time. It's advisable to check for any electrical discharge points in the vehicle's circuit, including installed anti-theft alarms, which can also self-discharge. Of course, the battery itself might not hold a charge, in which case replacement is necessary.
There's really no universal standard for motorcycle fuse amperage—it entirely depends on your bike model and specific circuit location. For example, turn signals might only need 5A, while headlight circuits often require 10A to 15A. When I upgraded my audio system last time, I checked the service manual: main power fuses generally start at 15A, while precision components like fuel injection systems may use just 5A. Seasoned riders advise against blind replacement—some bikes hide fuse boxes under seats or behind side covers, so locate them first. The safest approach is checking your owner's manual or the original fuse's printed rating. Randomly installing higher-amp fuses risks wiring damage, which is a real headache.
