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Hold-On Winding

Connect ohmmeter between small unmarked terminal of solenoid and a good ground on solenoid body. If resistance is not within specifications, hold-on (shunt) windings are bad, replace solenoid.

Vehicle Application  Resistance (Ohms) 
MGB & Austin Marina .67-.73
TR6 & TR7 .76-.80
Jaguar V12 1.49-1.71
Fig 1: Lucas Starter Solenoid
G09350300Courtesy of NOT AVAILABLE