Plugging into shore power.... Buzzing noise

Slojoe72 wrote:
So the noise is coming from the automatic power switch panel. I took the cover off to investigate. It appears there is 2 switches, and 3 groups of wires going to panel. 1input from gen, 1from shore and 1output to the motorhome. When switch it activated either by shore or gen there is a black switch right in the middle that click in (on) and clicks out (off). The 1for
the shore power is what's buzzing/rattling. When plugging into shore the top switch clicks on and starts the noise. I left plugged in for a while and it was providing power to the motorhome. After a little while it started to quiet down to like an electrical hum, but would get loud again from time to time. I went over to the switch and with a screwdriver pushed on the black switch in the middle that clicks in and out, and noise totally went away. So do I just need to replace that one.... And where to buy?

Sounds like a heavy duty contactor, so just take it apart and clean up the rust and such from the laminated magnetic core or other. Remove the contacts and file or emery cloth them clean. Spray the whole thing with a non-conductive electrical cleaner which may be hard to find for any reasonable price. In fact I even use conductive stuff that will air dry pretty quickly.
Or......you can do what I've explained previously and be done with it all. After that, when you store away your cord, simply plug it in to your newly installed generator outlet and you should be good to go.