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Most automotive timing lights (or "strobe" lights because of their pulsing light when operated) have three wires --- one for positive (the red clip), one for negative (the black clip), and one for the #1 spark plug. Before starting, determine which plug on your engine is the #1 -- generally, it's the one closest to the radiator fan on a 4-cylinder and on a 6 or 8-cylinder the same but on the right or left side depending on the engine. Hook the red clip to the positive post on the battery, the black clip to the negative post, and the third wire to the #1 spark plug. If your timing light has an "inductive" pickup clip (MUCH easier, btw), then simply hook the clip to the #1 spark plug wire, making sure the correct side of the clip is facing the spark plug. There should be an indicator on the clip informing you which side faces the plug. If your timing light has a "direct connector" to the #1 plug, then remove the spark plug wire boot from #1, and connect the "direct connector" between the top of the #1 plug and the spark plug wire boot. And you're good to go!

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