John,
As long as you are unplugged from AC power, inverter is off, and generator not running all should be well. Once you are able to clean or blow out the contacts you can reconnect at the power pole and see if it all works. If not you can then take a meter, set on AC volts, and measure between the white wire which is neutral, usually the center wire in the transfer relay, and the black or red wire which are hot legs. Measure on both the input and output side of the relay to see if voltage is available at the input and if it is passing through. Only one of the two relays will have power on the line side with the generator off and the main RV cord plugged in. If one side is not passing voltage that is your problem. If one side does not have power coming in then your problem is before the transfer switch, possibly the cord or plug, or a loose connection, or even the power source at the plug in. If you are unsure about taking measurements with power on then get some help to trouble shoot this. Safety first...
Later Ed