Todd Power transfer switch
Hi, newbie here. Picked up my new to me 1999 Monaco Diplomat last Wednesday. When we looked at it, everything was fine, it was plugged in and the genset(diesel) ran great. Got it home, plugged it in(had to use a 20/50 amp connector). Was woken that night to the sound of an electrical surging/bumping, sound. Cord was warm, disconnected it and the sound went away. Wired in 30 amp outlet in the garage, picked up a 10/3 30 amp cord, connected to the motorhome, 20 minutes later I have the same condition, electrical vibration/surging from the transfer switch contactors, Nothing in the motorhome was turned on, no load condition. Opened the power transfer switch prior to trying this, checked all set screws, all were tight. Power switch toast?
Thanks for your input/help.