In order to solve the problem of NFF (No-Faults-Found) caused by the electrical connector corrosion failure of an amphibious armored equipment, this paper studies the impact of the electrical connector corrosion failure on the signal transmission based on the principle analysis and the circuit simulation. The corrosion failure mechanism of the electrical connector in a salt spray environment is analyzed. The electrical contact impedance model and the circuit of the corrosive connector are established and the circuit characteristics in the corrosive failure state are analyzed. The impact of the corrosive failure on the signal transmission is studied by simulating the circuit with different impedance values. The results show that the electrical contact impedance formed by the corrosion failure of the electrical connector will lead to the transmission distortion of high frequency signals. The increase of the contact resistance reduces the amplitude of the signal wave and even completely distorts the signal. But in the limited scope, the presence of the contact capacitor provides a pathway for high frequency signals and reduces their distortion.