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There are two strategies you can use to avoid miswiring when adding a new set of plug wires. One is to remove and replace one wire at a time. Another option, shown here, is to trace each wire from the cap to its spark plug and make a drawing of each wire’s location on the cap for reference. If you’re working on an engine with no wires on it to start with, you’ll need to know the engine’s firing order, the direction of distributor rotation, and how the cylinders are numbered on the engine.