The early outside plug 250 series engines used a small carbon brush assembly to activate the cooling fan clutch. This is a pencil-sized plastic assembly, held in place by a spring clip, with a small spring-loaded carbon brush that sends an electrical signal to activate a magnetic clutch to engage the radiator cooling fan. The design was improved on the later 250 cars with the addition of a second ground brush. The earlier assembly is shown on page 285 of Dick Merritt’s book Ferrari:Operating, Maintenance, and Service Handbooks 1948-1963. The later configuration, with the ground brush, is shown on page 170 of the “Carbooks” 275 Manual reprint. Ground Brush, the correct carbon brush and spring
These smaller sized terminal boots have been seen on some of the very early cars. They are the same basic design as the others but have a smaller 9mm O.D. barrel. They may have been used on the earlier cars or may have just been a different design from a different supplier. 9mm Wire Terminal Boots.
Enzo Ferrari always liked the wiring and plumbing to be neat and orderly. The plug wires on the V-12 engines were gathered together at the base of the distributor bodies by two small loop type brackets. The early cars used black steel brackets. At “about” the time of the change to the outside plug heads (Chassis near #1,500) the brackets were cad-plated. Each bracket had a rubber grommet to avoid chafing the wires and an “O” ring to gather the wires above and below the bracket. Black Spark Plug Wire Bracket
These are 100 pt. reproductions of original pieces that I borrowed from a 250GTE, in Italy, in 2001. These are perfect, with the correct cad-plated bolt and nut. These are appropriate for 250GTEs and earlier cars. The original pieces were made of brass, but they often appear to be a silver color because they were “tinned” when they were attached to the cables. During the run of the 250 Lussos and late GTEs (1964…?) a change was made to the later type, which have been remanufactured by Mike Dunn. 250 Type Battery Cable Ends