check the frame to enine ground. put your meter on d/c volts and put 1 lead on the battery negative and the engine and crank engine. any reading above 0.3 volts is too much replace cable. same applies to positive cable, check at positive cable and large lug on starter. these are voltege drop tests and are the most accurate way to determine how good the circuit is. the higher the reading the worse the problem. due to the way a toyota is cabled it is possible to have full voltage to the control side and little or none at the starter.