Hey Everyone! I have a 2001 Forest River Cardinal 5TH Wheel. I am hooked up to shore power constantly. The breaker box / converter makes this weird humming noise, the noise stops when I turn the air fryer on though. it may also stop when I use the AC. It will randomly get louder or quieter on its own The noise will also stop when i shut the main breaker off. Any insight would be great!
Attached is the video!


Probably the transformer in the converter/battery charger. Try turning the breaker off for the converter and see if it stops. It’s normal behavior on older, transformer-based chargers to hum a bit due to imperfections in the windings.

Source: Electrical Question!

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