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I had a similar problem about a year ago. The headlights kept burning out. Only lasted 3 or 4 days and they would burn out. It turned out to be a bad voltage regulator. Something about bulbs not lasting long with 18 volts instead of the usual 12!!!!! I replaced the alternator (the voltage regulator is internal to the alternator) and all is well again. I bought a used alternator on ebay for $50. Much cheaper than going to the dealer.
Hope this helps,
Dave 1994 855T 273,000 miles and still going strong.
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