As stated less Ohms are better at voltage transfer through the wire. The spark plug wire has one crucial job: to deliver the high voltage from the ignition coil or distributor to the spark plug.

When spark plug wire resistance is too high, the spark plug won’t receive enough voltage to create a strong spark..

Spark energy travels from the ignition coil or distributor through the spark plug wire to get to the spark plug, which is why the plug wire is also called an ignition wire or coil wire.

Now, imagine the plug wire is a water hose, and the spark is the water running through it. Resistance would be like sand in the hose, impeding the water’s flow.

Lower resistance means more spark energy from the coil reaches the spark plug to ignite the air-fuel mixture in the cylinder. And the converse applies with higher resistance.

The distance traveled also matters. So, spark plug wire resistance is measured in ohms per foot. A high resistance wire can measure around 5,000 ohms per foot, while a low resistance wire can easily fall in the 2-digit ohm per foot range.

Here are some examples of plug wire resistance per foot:

Copper core wire: 1-6,500 ohms
Inductive wire: 650-2,500 ohms
Carbon core wire: 3,000-7,000 ohms

How To Test Spark Plug Wire Resistance

Measuring the spark plug wire resistance is pretty straightforward. You’ll need an ohm meter or digital multimeter (set to measure ohms).

With the engine off, here’s how:

1. Detach the sparkplug wire at each end — from the spark plug connector and ignition coil (or distributor) connector.

2. Check your owner’s manual for your plug wire resistance range — it’ll be in kiloohm (k ohm). Multiply the wire length in ohms per foot (if your wire is 2 feet long and the manual requires 15-19k ohms per foot, you’d want a measurement of 30-38k ohms).

3. Set the ohm meter to the nearest setting larger than the required resistance range (e.g., for a 15-19k ohm range, set the dial to “20k”).

4. Touch the ohm meter leads to a metal center at each connector end of the spark plug wire, and note down the reading.

5. Compare the ohm meter reading to your required specification.

Higher readings mean too much resistance in the ignition wire, and you should probably get a new wire. Even if the spark wire meets specifications, you should still check it for physical damage and voltage leaks.

As other have stated, get the Firecore Wires!