I changed my stock 65W alternator in my C250D for a 90W alternator out of an E300D after I had some light flashing problems when I got stuck in traffic and was listening to some (too loud) music...
I have 3 amplifiers in my car and always drive with my lights on. When I get stuck in a traffic jam, it takes some time before my lights start to flash on the rhythm of the music...

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)