I have a headlight bulb blow about every 600-1000km on my bike and I can't figure out why. I disconnected the headlight plug of the blown bulb and started the engine and the output voltage is around 13.3V when the engine is idling, but the voltage drops to around 12.5V at 4,000RPM. The voltage appears to drop as the revs increase which seems a bit strange to me.
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