For the 1965 Formula One season, Rindt signed as a permanent driver with Cooper, paired with Bruce McLaren. He was not immediately successful as Cooper, formerly a top team, were struggling at the time. In his first race, the 1965 South African Grand Prix, he developed transistor trouble; the damage was initially repaired but the problem recurred and Rindt had to retire from the race. His best result was a fourth place at the German Grand Prix at the Nürburgring. He ended the season with four points, 13th in the championship.