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For two days the voltage spiked to 14.7-14.8 volts. Didn’t think much about it until it burned out the headlamp. I wouldn’t.t have even known it but for the fact that after the alternator imploded and was replaced I installed a volt gauge and battery monitor, which starting blinking on the high side of double green. The only thing I did out of the ordinary was d-salinate the bike after a week of salty slushy road conditions in NePA. Voltage stabilized at the usual 14.3 - 14.5, replaced the H-4, and all has been good now for two days.
 
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I would assume anything over 14.5V is too high, but do you think the 0.3V difference is enough to burn a bulb? Is it possible the bulb was damaged when the alternator failed?
 

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with my experience with F800 and G650, alternator failure where caused by poor alternator design (not able to dissipate heat in excess) and very poor voltage regulator.
On both the bikes the suggested mod (also to prevent alternator failure) consisted in replacing the voltage regulator with the Shindengen SH775 ant it's subsequent models

here major details
https://www.roadstercycle.com/
 

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Discussion Starter #4
probably not

I would assume anything over 14.5V is too high, but do you think the 0.3V difference is enough to burn a bulb? Is it possible the bulb was damaged when the alternator failed?

The alternator went south almost a year and 9000 miles ago. It could just be a coincidence considering how much the 310 headlamp bounces around in those rubber mounts.
 
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