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Message: <blockquote data-quote="trumpet" data-source="post: 8151916" data-attributes="member: 628688"><p>They work if they're installed in the right place. All they do is block AC voltage from passing through a DC circuit. The AC component is noise. AM radio reception is highly susceptible to interference. There are some tricks to finding the general source of the noise, and often it's because of a bad ground connection somewhere. The good old school installers know how to troubleshoot this problem, so try going to someone who actually knows what they're doing.</p></blockquote><p></p>

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