![]() ![]() Resistor in spark plug with copper conductor.To reduce radio frequency interference (RFI) produced by the spark being radiated by the wires, which may cause malfunction of sensitive electronic systems in modern vehicles or interfere with the car radio, various means in the spark plug and associated lead have been used over time to reduce the nuisance: There are dedicated spark plug wire pliers, tools designed for removing the terminal from a spark plug without damaging it. Each end of a spark plug wire has a metal terminal that clips onto the spark plug and distributor, coil, or magneto. The wire from each spark plug is just long enough to reach the distributor, without excess. Ĭandle Cable Production (Patent UA2016A009030 ) High tension may also be referred to as HT. Each lead contains only one wire, as the current does not return through the same lead, but through the earthed/grounded engine which is connected to the opposite battery terminal (negative terminal on modern engines). ![]() High tension leads, like many engine components, wear out over time. Tension in this instance is a synonym for voltage. "High tension lead" or "cable" is also used for any electrical cable carrying a high voltage in any context. High tension leads or high tension cables or spark plug wires or spark plug cables, colloquially referred to as HT leads, are the wires that connect a distributor, ignition coil, or magneto to each of the spark plugs in some types of internal combustion engine.
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