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When RV is plugged in to an electrical 110 outlet it has a loud hum noise that appears to be coming from the RV Electrical Control Center Model 80. This is in a 1990 Bounder Class A motorhome. Any suggestions on this matter would be greatley appreciated. Thanks.
It sounds to me that it would be coming from your power converter.
Either you have alot of 12 volt items running while your plugged into the 110 volt outlet or your backup batteries are weak and is in a charge mode.