i have a 1985 500sel and some times the right headlight is brighter than the left or visa versa. why is this it is rellay annyoying to me is there a way to fix it

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Dan Younes
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1985 euro 500sel 220k
1981 300sd 278k sold
1979 240d 298k sold
1983 300d 272k sold
1989 chrysler 2.2l Turbo
Leabaron 130k
1991 300e 2.6 (hopefully soon)