How Many Ohms Should a Spark Plug Wire Have

A spark plug wire is an important part of a car’s ignition system. It carries the electrical current from the ignition coil to the spark plugs. The resistance of a spark plug wire determines how much voltage is lost between the coil and the plugs.

A higher resistance means less voltage reaches the plugs, which can lead to misfires. Most spark plug wires have a resistance of about 10,000 ohms per foot. Some aftermarket wires claim to have lower resistances, but they may not be compatible with all ignitions and can cause problems.

If you’re wondering how many ohms should a spark plug wire have, the answer is: it depends. The resistance of a spark plug wire is important because it needs to be high enough to prevent voltage loss, but not so high that it causes interference. The resistance also needs to be matched to the coil so that the spark plugs fire at the correct time.

How Many Ohms Should a Spark Plug Wire Have


How Do You Check a Spark Plug Wire With a Multimeter?

If you’re having trouble starting your car or it’s running rough, one possible issue is a bad spark plug wire. You can use a multimeter to test for continuity in the wire to see if it’s the cause of the problem. To check a spark plug wire with a multimeter, first make sure that the engine is off and the spark plug wires are disconnected from the spark plugs.

Then, set your multimeter to the “continuity” setting and touch one lead to each end of the spark plug wire. If there’s continuity, that means there’s no break in the wire and it’s not causing your starting issues. If there’s no continuity, that means there’s a break somewhere in the wire and it needs to be replaced.

How Can You Tell If a Spark Plug Wire is Bad?

If your vehicle is experiencing any of the following symptoms, it may have a bad spark plug wire: -engine misfires -poor fuel economy

-backfiring or popping noises from the engine -weak acceleration

Is Higher Ohms Better for Spark Plug Wires?

When it comes to spark plug wires, the general rule of thumb is that higher ohms are better. This is because higher ohm wires offer more resistance to electrical current, which in turn helps to prevent interference and voltage loss. Additionally, high-ohm wires tend to be more durable and last longer than their lower-ohm counterparts.

Of course, there are a few exceptions to this rule. For example, if you’re using very high performance ignition components (such as an aftermarket coil), then you may need to use lower ohm wires in order to prevent voltage loss. Additionally, if your engine is susceptible to radio frequency interference (RFI), then you may need to use special RFI-resistant spark plug wires.

Overall, though, the vast majority of engines will perform best with high-ohm spark plug wires. So if you’re not sure which type of wire to use, err on the side of caution and go with a high-ohm variety.

Do Spark Plug Wires Have Resistance?

Yes, spark plug wires have resistance. The amount of resistance in a wire is measured in ohms, and the higher the number of ohms, the more resistant the wire is to electrical current. Most spark plug wires have a resistance of between 5 and 15 ohms per foot.

Spark Plug Wire Resistance High Or Low

If you’re experiencing issues with your vehicle’s spark plug wires, it’s important to check the resistance. This can be done with a multimeter. If the reading is high, it means that the wire is not able to conduct electricity properly and needs to be replaced.

A low reading indicates that the wire is able to conduct electricity but is losing some of it through resistance. In this case, you may be able to improve performance by replacing the wires with ones that have lower resistance.


Spark plugs are an essential component in any gasoline engine, and the quality of the spark plug wires can have a big impact on performance. In general, it’s best to use spark plug wires with as low an ohm rating as possible. This will help ensure that the spark plugs are getting enough power and will help prevent misfires.