Problems with Light Light Behind Opel Astra G

Hello, follow the following steps and you will come to a good end First make sure you have energy at both ends of the fuse looks at the color of the cables and tries to use them in the back sensor in the gearbox near the lever measures if energy arrives and with the march behind connected and car the in contact measures if it comes out energy by the other cable if everything is well measured in the rear lanterns if energy arrives. Humidity and good earth I hope this is lucky