My owner's manual agrees with Brian. Says when lights are on and you wash windshield, lights will get a good scrubbing too. As for fuses, etc. no clue. I have no idea if my own actually work.

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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)