I've got OEM jewel headlamps that I've retrofitted with upgraded sockets I spliced in after the original sockets burned themselves up (not literally). Tonight, after three+ years, one side of the PIAA Xtreme White H11 bulbs I've been running blew out. No problem, I thought, as I pulled out the backup bulb I saved when I replaced both bulbs after only one side went out, keeping the old but working bulb as a spare. Well, the spare immediately blew as well. There is a dark spot on the glass on both blown bulbs. So now I'm afraid there's a surge happening, and any additional bulb will suffer the same fate. I was going to just buy the cheapest H11 bulb I could find and hope for the best, but I fear the worst. How would one troubleshoot this?