Sounds like it is your converter keeping up with the demand. the more lights you turn on the harder the converter works. You should hear the fan on the converter running. If only a humming and no fan noise, I would open the panel and see if the fan is working, you may need to replace it. Changing your bulbs to LED will reduce the load on the converter and help keep things quiet.
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Jason & Wendy
2014 Ford F-350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
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