The Giants had made a bright start with Yorick Williams leading his side with nine points as they established a 26-20 advantage.
The lead hit double figures at one stage in the second with the Giants still in control at the half-time break at 51-43.
Surrey were still eight behind at the mid-point in the third before producing a pivotal 13-0 spell to seize the initiative.
The Scorchers carried the momentum into the final period and stormed clear to complete a 14-point victory.
Callum Jones and Yorick Williams finished with 17 points apiece as the Giants drop to 4-22.
Jordan Williams impressed with 23 points, 12 rebounds and five assists to help the Scorchers pick up their 11th league win.