Reproduction of original Lucas Q12 coil fitted between the late 1930's and the mid 1950's. Has screw in lead. Terminal CB is positive and SW is negative. Primary coil resistance 3.6 ohms and secondary coil resistance 15.5 k/ohms. Not supplied with the the main HT nut or brass washer. It is imperative that the +ve and -ve connections are made correctly. This coil is labelled for use on +ve earth vehicles, but if using on a -ve earth vehicle, connect the 12v supply to the CB terminal and the ditributor points to the SW terminal. Lucas part number 40520
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