Did you mention what make and model converter you have?
Some rigs may have a converter that does indeed have a relay.. If the plug was barely making contact then as the converter engaged it pulled in a relay, this caused the current draw on the power cord to increase and with the "Just barely" contact at the pole it dropped the voltage, now the converter drops out, this causes the relay to release to the "No-shore power" condition. and the load on the cord is reduced, now the poor connection is able to bring the voltage back up and the relay pulls in again.
And sometimes fans in converters run even when there is no shore power. they are usually 12vdc fans and t-stat controlled.
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