Ruxton, a bay gelding owned by August A. Busch Jr. and Cismont Manor Farm of Keswick, Va., won the overall high score award in the Horse of the Year Championships recently announced by the American Horse Shows Association.

Ridden throughout the season by Charlie Weaver of Fairfax, and trained by Kenneth Wheeler, Ruxton also was honored as the champion in the regular working hunter category for the second consecutive year.

Wheeler, co-owner and operator of Cismont Manor Farm and the 1976 horseman of the year, also handled three other winners. The A.C. Brady Stables' Light The Way was 2-year-old horse of the year, Mrs. Haywood Nelm's Just For Fun was 3-year-old champion, and Weather Permitting, the second entry of Busch and Cismont Manor, was the reserve champion in the regular conformation hunter division.

Front and Center, owned by Sallie J. Sexton of Middleburg, was named horse of the year in the yearling division. Her second entry, Bold Heathen, took reserve in the 3-year-old class.

Also from Middleburg, Betty F. McGuire's Harvard Square won the green conformation horse of the year award. Another Yankee, owned by Joan Wilson of Adelphi, Md., was named reserve among 2-year-old horses.