Dave, if you are talking about the visor retainer clips, check each with a voltmeter to see if you're getting 12 volts from each. Then, if you are, seriously clean the little slip rings on the visors. These can get dirty and give you intermittent contact. I have had this little problem twice and cleaning them did the trick. Good Luck..

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Jeff Lawrence
1987 300e
1989 300e
1987 BMW 325