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The four wire 220 twist lock receptacle Two hot wires, one neutral, and a safety ground. Depending on your generators setup the neutral and ground are bonded as one; unless, it setup for a floating neutral.
You would normally connect the two hots and neutral. and leave the ground open on the four prong twist lock plug. Just make sure the compressor is earth grounded on its end.
You do not want to convert anything to a 220 v connection !!!! Your RV is 12 volt DC and 120 volt AC. Use a 30amp female to 15 amp male adapter to plug in to regular household receptacle on generator. Available at hardware store and RV stores.
Your generator is a welder?? Yikes, the 220 volts coming out of the genny is not the same as the 220 volts running a welder, it is, but it isn't, the 220 volts used to run the welder are transformed into DC, in the 50 -150 amp range, the 220 volts coming out of your genny is 220 volts, AC, at 30-40-50 amps. Now exactly how were you welding with 220 volts AC? Remove anything plugged into the genny, check the oil, check the gas, make sure it is fresh, check the breakers, check the fuses, get it running, now don't try to weld with it again. Unless you have a big welder to plug into it and I wouldn't even do that because of the generator spikes. I might be wrong, but I have never seen a genny with a welder on it for home use.
The generator has two joined circuit breakers that each are 110 volts. Between the two is 220.
If just one of those is opening WITH NOTHING PLUGGED IN, then there are only a few explanations.
1. There is a short in the wiring or the wiring has been tampered with and connected incorrectely.
2. The switch that switches the mode from 120 to 240 has gone bad, possibly with a welded contact. This would occur if the switch is changed with load on the generator. This could put a driect short on half the generator winding and cause one of the breakers to blow.
3. Worst is a winding short in the generator. Fortunately this is the least likely.
4. The 220 receptacle has been broken and insulation failed shorting one terminal to another.
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