On the other hand, many import models like Nissan, Honda, and Toyota use spiral-wound stainless steel mag wires with approximately 500 ohms of resistance per foot of wire. Most domestic vehicles use spark plug wires with a fiber glass core covered in latex graphite, which provides between 10,000 and 12,000 ohms of resistance per foot of wire.The distributor rotates clockwise on Ford V6 and straight 6-cylinder engines, and also clockwise on Ford 2.0L and 2.3L four-cylinder engines. Lastly, you'll want to multiply the length of the wire in feet by the ohms-per-foot specification for your vehicle. Ford V8 distributors rotate in a counter-clockwise direction, so the next plug wire in the cap would go to the next spark plug in the firing sequence for that engine.Make a note of the wire's resistance on the piece of paper as well.Then, turn on your ohmmeter and connect one lead to a metal connector inside the spark plug wire boot and the other lead to the other connector in the wire.Measure the length of the wire you want to read first using the tape measure, and make a note of the length in feet on a piece of paper.Set your meter to the ohms scale and to a setting that will let you read 50,000 ohms or above.For this test, use a simple analog or digital ohmmeter. With this test, you'll check the condition of the conductor that runs through the thick insulation of your spark plug wires. If you don't, you'll upset the firing order of the ignition system, and the engine won't operate properly, if at all. This way, you'll plug each wire back to its corresponding cylinder. That is, disconnect one wire, proceed with the two tests, reconnect the wire, and then test the next wire. Note: For the next two tests, work on one spark plug wire at a time. If your wires appear to have no voltage leaks, go on to the next two tests.Did you detect any sparks or snapping sound during your test? Replace the wires.Even if you can't see the arc, you'll hear a cracking sound as the spark jumps to the screwdriver, so pay attention to any sounds as well. Pay attention to any spark or electric arc jumping off the insulation toward the tip of the screwdriver. Now, run the tip of the screwdriver along the length of each spark plug wire, about an inch away from the insulation.Set the emergency brakes on your vehicle, start the engine, and let it idle.Then, connect the other end of the jumper wire to a metal bracket or screw on the engine to ground the screwdriver.Through rigorous testing, these parts meet the strict high-quality standards of Ford Motor Company. Connect one end of a jumper wire to a screwdriver metal shank. Ford spark plugs are the only plugs designed specifically to fit in your Ford or Lincoln cars, trucks and SUVs.
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