Should it appear from the answer of the garnishee or should it be otherwise made to appear and be found by the court that the garnishee is indebted to the defendant in any amount, or was so indebted when the writ of garnishment was served, the court shall render judgment for the plaintiff against the garnishee for the amount so admitted or found to be due to the defendant from the garnishee, unless such amount is in excess of the amount of the plaintiff's judgment against the defendant with interest and costs, in which case, judgment shall be rendered against the garnishee for the full amount of the judgment already rendered against the defendant, together with interest and costs of the suit in the original case and also in the garnishment proceedings. If the garnishee fail or refuse to pay such judgment rendered against him, execution shall issue thereon in the same manner and under the same conditions as is or may be provided for the issuance of execution in other cases.