Spark Plug & Ignition System Basics - Night School
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This is also a problem: The wire from the coil to the ballast resistor has frayed to two fine strands. Wire on vintage trucks is prone to wear and fatigue over time. Six-volt systems are often cloth-wrapped wire. Twelve-volt systems have plastic coatings that get brittle over time or short internally. When in doubt, rewire the system, using an appropriate resistor on the primary circuit if required. View Related Article
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