Originally Posted by biteabee
Had radio buzz problem from beginning and has been at the dealers for five weeks. Filters have been tried. They are going to try a new converter that they have been waiting for, two weeks now, not in yet. Same on both radios in all modes of operation driving with master switch on or off and engine off with external power or master switch on alone. When starting out cold sometimes will be clear for around three minutes. On one occasion while driving radio cleared for a few minutes when master switch was turned off. Any ideas?
Suggestions; First and foremost, your RV dealer does not sell or service audio systems, nor are the guys back in the service area skilled. As evidenced by how long they have had it so far.
Most non-equipment related problems in car audio are the result of poorly chosen ground points. Always check the integrity of every connection including the battery, head unit, amplifiers and signal processors. Any part of the audio system can bring noise into the system. In general your connections need to be secure (grounds should be to the chassis), the charging system should be in top condition and all factory connections (battery posts, ground strap, alternator connections) should be secure. You may need to increase the size of your factory ground if you install a very large stereo system. It should also be noted that the negative battery post is usually a terrible place to ground car audio equipment. All of the ripple (noise) from the alternator and other items in the vehicle travel to this point. If you choose it as a ground point then you are inviting all of these elements into your sound system.
It is a result of a "ground Loop" where in something is not properly grounded with regards to everything else in the "system."
Sharing grounds with equipment that is not part of your "audio" system, such as refrigerators, air conditioners, and other appliances and equipment most commonly causes it.
Take it to an audio shop and have the dealer billed. Of course you need FR to approve it. And they should, because they shipped it to the dealer with the issue.