The electrical resistivity of ternary alloys is calculated in the coherent potential approximation (CPA). Possible types of dependence on annealing temperature are established and it is found that there may be an abnormal increase of resistivity in the range of the ordered phase. The results of our experimental investigation of the resistivity of nickel-palladium-molybdenum alloys are set out. The unusual temperature dependence of the resistivity of the disordered alloys is interpreted as being due to the influence of short-range order on the spectrum.