Description:Some models of German cars and American cars will output voltage interference after the engine is started. The power supply to the reversing light is not pure DC power supply, but a pulse signal is superimposed on top oscilloscope can be used to test if the conditions will it found a similar squarewave signal. Camera power supply line directly on the reversing light, because the working voltage is very unstable cause the camera does not work properly, the video signal output is also not normal, so the host can see there is a severe interference, jitter, or not to switch reversing screen.Features:brand new, stabilized 12 DC power filter rectifier for car rearview camera. Used to supply the stabilized 12V DC power to the rear camera. To solve the issue of the "screen cyclowarp" or "black screen" when using a rear camera reversing. Professional manufacturing, high characteristic and stable performance. Easy to install, input connect with reversing light positive and negative, output wire connect with camera positive and negative. Specifications:Condition: Brand NewMaterial: PlasticColor: BlackSize: 4.8 * 2.6 * 1.5cm/1.9 * 1.0 * 0.6inPackage Weight: approx.17gFitment: for Germany/American Car SeriesPackage List:1 * RectifierInstallation Method:Input Red Wire: Reversing Light Positive PoleInput Black Wire: Reversing Light Negative PoleOutput Red Wire: Camera Positive PoleOutput Black Wire: Camera Negative PoleNote:German cars generally do not connect the black output line, most of the American cars can be connected.Please do not purchase if your car is non-German or AmericanCar Series, because there is different currents for different car series, non-pulsed signal interference, use this filterline is invalid!.