Quote:
Originally Posted by Nedlom
https://priuschat.com/threads/my-toy...5#post-2342985
Seems to be a design flaw with a simple fix (I've not investigated it fully though, since I don't own a prius)
Too many volts getting to the headlights, shortens the bulb life. Fix is extra wire to increase the voltage drop slightly?
Check out the link, see if that makes sense...
Chris 
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I had this problem on my cts with cheap led license plate lights. Would burn out very fast in winter when the charging voltage would occasionally hit 15.1v when temps were very cold on an older battery.