What Is a Jump Wire for a Spark Plug?

Answer A jump wire is a tool used for testing the insulation of a spark plug wire. If the insulation of a plug wire fails, the wire may arc, causing many electrical and mechanical problems.

Top Q&A For: What Is a Jump Wire for a Spark Plug

What gauge is a spark plug wire?

Spark plug wires have a total diameter--including insulation--of about 7 to 8 mm. Some plug wires have a solid wire core, but most have a composite conductor to suppress EMI, or electromagnetic int... Read More »

What Are the Causes of a Spark Plug Wire Malfunction?

Spark plug wires carry the ignition spark from the distributor or ignition module to the spark plugs. Depending on the year and model of vehicle, plug wires should be replaced anywhere between 24,0... Read More »

How to Fix a Spark Plug Wire Mix Up?

Your car coughs and jerks down the road after an amateur spark plug change--chances are you mixed up the spark plug wires. The "firing order" of the spark plugs refers to the order in which the dis... Read More »

Why Put a Resistor in a Spark Plug Wire?

A spark plug refers to a device designed to ignite the fuel-air mixture used by a vehicle's internal combustion engine. Resistors are placed in spark plug wires to control electronic interference.