Join Date: Mar 2005
Location: Scottsdale, Arizona
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Actually I have another theory, ive only seen this problem exhibited on 92 and 93 bmws before and lo-and-behold, i checked out the wiring diagrams of the charging systems of all the year bmws and 92 and 93 had the same charging system and they changed it in 94 and beyond.
aparently they added an uncoupling diode to the climate control module that is supposed to prevent the a/c of the alternator from fucx0ring with the rest of the d/c system by having interference.
thus is my theory at least, ill test it when i get home from vacation next week or so.
if it doesnt work ill just put a .25 farad cap inline with my headlights so they dont pulse witht he rest of the lighting system so at least they'll be safe even if the problem cant be solved.
but im pretty sure thats the problem as its the main change that bmw did to the charging system from 93 to 94, and 94's and later never seem to exhibit the problem.