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Ignition coil

Ignition coil
with push-in HT lead terminal and approx. 2.8 Ohm primary resistance. Non ballasted type

Land Rover Series III 4 cylinder Petrol (1971-85)

MG MGA (1955-62) • MGB and MGB V8 chrome bumper (to September 1974) • MGC (1967-69)

Aston Martin DB4, DB5, DB6 MK I

Morris Minor with 803 cc, 948 cc and 1098 cc engines (1952-71)

Sprite / Midget 948, 1098 and 1275 (1958-74)

Triumph Herald (1959-71) • TR2, TR3, TR3A, TR3B, TR4 and TR4A (1952-67)

Ignition coils have a “+” (POS) and a “-” (NEG) next to each of it’s two low voltage terminals. That’s because coils need to have the same polarity as your system: wiring backwards will weaken the spark. The wire that goes between the distributor points and the low voltage terminal on your coil, the low tension lead, should be connected to the terminal that is labelled for the same polarity as your battery ground. For instance in an early positive earth British Classic Car, the low tension lead should attach at the terminal marked “+” (POS). If that same vehicle were converted to negative earth the coil should be turned 180 degrees in the holder and the wire connected to the “-” (NEG) terminal.