Audio Systems: Camper speaker problem, electrolytic capacitors, dc devices

Question
My wife and I recently purchased a used 35 ft camper which is permanently placed on a lot in a campground.  The site has 120 volt AC running to it.  The camper also has a converter in it that transforms the AC to DC for some of the lights and other items in the camper that run on DC power.  The problem is that every time we turn on one of these DC devices (lights for example) we get a pop/hum noise that comes through the speakers that are throughout the camper.  Is there anything we can do to keep this from happening?

Answer
The inverter must be serviced.  The hum is most likely coming from the output of the inverter.  It is common for the filtering circuit to become ineffective due to old or gassy electrolytic capacitors.  They must be replaced.  The cost is  not so much as the caps are only a few dollars each and there are probably two or three of them at most.

Also, there could be poor grounding around the inverter.  Over time a connection will become corroded or weak which causes excessive current leakage.

If you are skilled in electrical and electronic things you may do the repair yourself, but if not, please call in an expert tech or take it to to a repair shop where the work on campers  (but they will probably want to replace the converter - which could be very expensive).

Hope this helps. But, let me know if there are further questions.

C