Ken Wheeler did weli at the Washington International Horse Show yesterday. The 1976 Horseman of the Year rode Early Light to the Green Conformation Hunter championship and handled Super Flash in that green working hunter's drive to the reserve tricolor in its division.

Wheeler, who heads Cismont Manor Farm in Keswick, Va., also rode Ruxton to victory in the Anne Hagner Christmas Memorial Trophy. The Martini-Rossi Award winner, who doubles as a trainer, last won the green conformation title 10 years ago with Slowdown, a horse that went on to become one of the legendary conformation hunters.

Early Light, a 5-year-old chestnut gelding, ran up 22 1/2 points, some won earlier this week to gain its tricolor. Early Light was third in the stake class yesterday behind First Light, ridden by Pat Heuckenroth. Second was Union Blue of Hunterdon, Inc., stable.

Hunterdon, Inc., former Olympian George Morris' stable in Pittsdown, N.J., also sent out Winter Sun, winner of the Green Working Hunter championship.

Morris also trained The Jones Kid, and rider Katie Monahan, the youthful pair that teamed Tuesday evening to set a Washington International Puissance (high jump) record of 7 feet 1 inch. The old record was held by Redney Jenkins and Idle Dice at seven feet.