A method of electrically connecting a first conductor composed of a first material, preferably aluminum, to a second conductor comprising or composed of a second material different from the first material, preferably copper, with a connector. For that purpose a connector precursor is provided, which includes a conductor core composed of the first material and sheathed by a casing layer composed of another material. The connector precursor has a first end and a second end. According to the method the casing layer is removed in the region of the first end to provide a contact surface. The first conductor is then connected to the first end in the region of the contact surface and the second conductor is connected to the second end of the connector. A connector and a system are also provided.