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Message: <blockquote data-quote="ttocs" data-source="post: 1079323" data-attributes="member: 11896">I have chased many many noise problems and even got desperate to the point of trying a loop isolator and honestly it only worked on time ever in the 15 yrs I installed.  First thing I would check for you is what I think is called the DV voltage condensor or something like that....  Look at the coil on the motor and you will see a small cylinder mounted too the back of it, that is it.  Check its connections that they are tight and clean, probably a good idea to disconnect it and then clean the connections rather then just looking honestly. After that I will sound like a broken tech-record but its true, check your grounds.  Again looking really doesn't do much good.  Remove the ground, use some sand paper to clean the conections(both sides) and then tighten them down.  is/was this a mach system or just the standard 5 x 7's and not tweeters in the mirrors?</blockquote>