If I turn on only one light in my 5th wheel, I get a hi-pitch squeal. When I turn on a second or more lights, the squeal stops. Is my inverter doing this? A problem?
If it's the 120v - 12v side, changing to LED's may help, might just move the problem so the squeal happens when you turn on 5 lights, or run the pump..etc.
Is this a problem when running on battery or just shore power?
Any experience soldering on circuit boards?
You mention inverter, you have a built in inverter (ie: 12v to 120v) or do you mean the converter (120v - 12v)?