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Message: <blockquote data-quote="cleonard" data-source="post: 82438" data-attributes="member: 21">If you add a small electrolytic capacitor to the DC side the fans will run better.  Some of them can have issues with the pulsating DC that the rectifier makes.  A capacitor will smooth those pulsations out to a more smooth DC voltage.  I'd try a 1000 microfarad 25 volt electrolytic.  You should be able to get that at Radio Shack as well.  If you are running a more powerful real motorcycle rad fan a larger capacitor will help.Most fans will run without the capacitor, but all will run better with it.I wrap most bullet or spade connections with a little electrical tape.  It keeps them from coming apart while riding.  Perhaps not so important on a fan, but it is on the ignition or lighting.</blockquote>