Half the electrical or half the outlets?
If you have a 50 amp RV proprly wired (Big if there) and one A/C works and one does not.. Then go to your breaker box (Even if it's both A/Cs work or not) and se if you can figure out which breakers are L-1 and Which are L-2
Breaker boxes are layed out in one of 3 basic patterns M=main, 1 and 2 are legs
M M 1 2 1 2 1 2....
M M
1 2
2 1
1 2
1 1 1 1 m m 2 2 2 2
If one leg is down.. your cord or transfer switch. OR the shore/generator breakres (not likely the breakers)