Enbl... That is the problem he has a 30 amp Marinco connector on the RV end of the cord he needs a 50.. I'm searching since I have the bandwidth
Found this one
Marinco 30-50 oneBut I'm not sure if he needs that one or it's mate (50-30)
Here is another but again I do not know if it is for connecting a 30 amp Rig to a 50 amp cord or the other way around (He needs the other way around)
Marinco 30-50 TwoFor the original poster.. Follow either link, then choose "Contact us" and ask which way the adapter goes.. Let us know please
If you want to replaxe the Marino End a marina will have the connector, but as I said they are expensive.
You need to jumper the two hot legs together. 10ga wire or better.