SL/R230: Static noise
01-05-2015, 03:44 PM
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2011 SL550
Static noise
11 SL550. Static & noise coming from RH area. Seems to be really bad after car wash or rain. Anywhere from loud cracking noise to soft hum but goes away after couple of dry days. No sign of internal leak. Does not make any difference if command center is on or off or volume of radio. Help!!
01-07-2015, 08:16 PM
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C300 4MATIC And formerly 73 450SL
I don't have an answer for you. But something you might try to get a more specific location of the source.
Chances are whatever the problem is, it is showing itself as a magnetic field. Get a compass. Pass it close to all body (inside and out and under the cars body) areas during a time when the problem is particularly loud. When the compass gets close to the magnetic field, it will go a little goofy. That is one possible source. Put a felt tip marker mark on that spot. (if you have multiple suspect locations)....Then go to the next one. Later on, when things dry out and the noise is not present. Do it again at each marked spot. At the one spot where you had a compass reaction before, But DO NOT have a reaction now, that is likely the area where this problem is going to be.
Magnetic fields of this type can come from improperly grounded, our errantly grounded currents. Or poor connections, or chafed wires or circuits. Some circuits can be in wiring harnesses, or inside of electrical components or housings. Those are the tough one to find. But check the component with the compass. If you cannot get inside the component to make a repair, you might want to replace the component if cheap enough. If it is an expensive component, consider sealing it tightly against humid conditions.
Let us know how you make out.
Chances are whatever the problem is, it is showing itself as a magnetic field. Get a compass. Pass it close to all body (inside and out and under the cars body) areas during a time when the problem is particularly loud. When the compass gets close to the magnetic field, it will go a little goofy. That is one possible source. Put a felt tip marker mark on that spot. (if you have multiple suspect locations)....Then go to the next one. Later on, when things dry out and the noise is not present. Do it again at each marked spot. At the one spot where you had a compass reaction before, But DO NOT have a reaction now, that is likely the area where this problem is going to be.
Magnetic fields of this type can come from improperly grounded, our errantly grounded currents. Or poor connections, or chafed wires or circuits. Some circuits can be in wiring harnesses, or inside of electrical components or housings. Those are the tough one to find. But check the component with the compass. If you cannot get inside the component to make a repair, you might want to replace the component if cheap enough. If it is an expensive component, consider sealing it tightly against humid conditions.
Let us know how you make out.
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