When installing an electronic truck scale, the signal cables of several outdoor weighing sensors are connected to the junction box through conduit, but a portion of the signal cable is still exposed. This small section of the signal cable provides some unscrupulous elements with a chance to take advantage of it. Under the temptation of profit, they will look for an opportunity to peel off the outer skin of one of the weighing sensor signal cables and disconnect the excitation voltage positive (+EX) line of the weighing sensor. If the sensor is connected in a six wire system, At the same time, disconnect the feedback voltage positive (+F) line and connect the remote control receiving device in series with the excitation voltage positive (+EX) line. On site, we also found that the receiving device is connected in series with the signal line (+Si or - Si). After the theft device is installed, it generally does not affect the normal use of the electronic truck scale. Only when the illegal elements open the remote control several tens of meters away from the scale body, and the receiver receives the signal, the relay in it acts, Connecting a resistor in series to the excitation voltage positive (+EX) line or signal line (+Si or - Si) causes a decrease in the power supply voltage of the weighing sensor Wheatstone bridge, or the signal line is connected in series with a resistor, resulting in a decrease in the output millivolt level electrical signal and ultimately a reduction in the weight of the car scale. This theft method is highly concealed, easy to operate, and difficult to detect. Installing a remote control device in the weighing display instrument is usually added before the A/D converter of the instrument, Adjusting the weighing indication of the weighing instrument by remotely changing the resistance value.