These wiring diagrams are for the 500 series Massey Ferguson tractors.
MF550, MF565, MF575, MF590
Click the link below to download the pdf wiring diagram…
The first diagram is of the main wiring. The second diagram is for the lights and warning lights wiring.
The electrical systems of these tractors are negative earth and charged by alternator (the alternator has a integral rectifier and control box). Always disconnect the battery before carrying out any work on the electrical system.
The belt tension of the alternator should be 0.5 inches at the mid-point of its longest span. Adjust as necessary.