Plugging into shore power.... Buzzing noise

falconman wrote:
You can try to clean it using compressed air but if it continues and it bothers you it will need replacing. It seems that older ATS used coils with AC switching and were prone to humming as the contactors wore. Older units also had the generator as the default so whenever shore power was present without the generator running you got the hum.
Newer models use DC voltage to switch the coils and the default is shore power, so no hum when plugged in. We just replaced ours with the newer version and it's dead silent now. They are not too expensive to buy but depending on the location it might be a simple or difficult install.

You seem to know and understand how this thing works, so let me ask you...and rather than replace the switch, why not just take the gen set output leads and connect up an outlet in it's place for the shore power plug?
I mean, you have to disconnect from the pedestal and store the cord away anyway, so how much trouble is it, to just plug into the gen set now? This eliminates the costly and sometimes troublesome and noisy sw. and you can only use one of them at a time anyway.
One might have to do something else with some units, like installing a little plug in relay from the 20amp gen feed for the rear air, but that's not much extra, if you're going to be doing some work here, anyway.