How much resistance should a spark plug wire have?

Simply attach or hold a meter probe on each end of the cable and read the total resistance on the meter. The Society of Automotive Engineers suggests the maximum resistance should be 12,000 ohms-per-foot.

Does resistance matter in spark plug wires?

The higher voltage of a coil on plug or distributor system can create enough voltage that a slightly higher resistance wire will not greatly affect spark strength, but the relatively lower output of a magneto means using a lower resistance wire is more important to ensure a hot spark from the spark plug.

Should a spark plug wire have continuity?

No. The spark plug wire resistance is too high. … Check the resistance of the wires with an ohmmeter. The specs for a ignition wire should be about, minimum – 250 ohms per inch, maximum – 1000 ohms per inch.

Why do spark plug wires have high resistance?

Description. Spark plug wires have an outer insulation several times thicker than the conductor, made of a very flexible and heat-resistant material such as silicone or EPDM rubber. The thick insulation prevents arcing from the cable to an earthed engine component.

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Can you test spark plug with multimeter?

An Ohm meter, which is part of a multimeter, can only check a spark plug for a short circuit or a breakdown of insulation resistance. A good spark plug should show an open circuit between the center electrode and the tip. … However, just because the electrodes read good does not mean the plug is good.

Does changing spark plug wires improve performance?

The short answer is Yes, when you replace the spark plugs and wires can increase your vehicle’s performance. New spark plugs help keep your engine at its peak performance and efficiency levels. … Worn or dirty spark plugs require higher voltage to get a strong enough spark to start a vehicle.

What is the best performance spark plug wires?

  1. Editor’s Pick: ACDelco. ACDelco offers a variety of spark plug wire sets for a wide range of applications and vehicles. …
  2. NGK. …
  3. MSD. …
  4. JEGS. …
  5. Denso. …
  6. Bosch.


Are spark plug wires all the same?

Plug wires are most often rated by their diameter. The most common are 7mm and 8mm thicknesses, but what’s more important is the conductor. The best choice is the spiro-wrap style Taylor wires that reduce resistance, minimize RFI noise, and offer the best performance.

What happens if you put spark plug wires on wrong?

When the firing order is wrong or delayed, the engine does not run properly. … When one or more spark plug wires are crossed, the engine may not run, or runs roughly as the timing of fuel/air compression does not align with the delivery of the spark.

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Why are my spark plug wires arcing?

When arcing like this occurs it is most likely due to a bad ground connection between the coil and the plugs. If the arc can’t find a good ground path through the plug gap it will find it elsewhere at the next weakest point.

What has the highest electrical resistance?

The material that has the highest electrical resistance is silver. After silver copper and gold are the materials that have the highest electrical resistance.