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Home >> Jaguar >> 1979 >> XJ12L >> Repair and Diagnosis >> Engine Performance >> Ignition System >> LUCAS "Opus" Electronic Ignition >> Distributor >> Ballast Resistor Unit
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Ballast Resistor Unit

All Jaguar models have a ballast resistor unit with 3 resistors enclosed in an aluminum heat sink. Two of the resistors are wired in series to coil primary winding. The third functions with the power transistor in the amplifier.