Diameter (in): 3/16 Inch. Diameter (mm): 5mm. The spark plug wire set in your Toyota Camry carries power from the distributor to the spark plugs. Each wire has a boot on both ends and a conductive wire core, which is insulated with rubber, to carry the charge. Spark plug wires and boots become worn with heat and over time. This vide will show you how to fix a broken spark plug wire that has pulled out of the spark plug boot on your lawn mower.DisclaimerOur videos are for entert USW. 4.4. (12) Check Vehicle Fit. Spark Plug Wire Set With Square Ignition Coil; With 12 Inch Wire; For Coils Stamped: 12558693. Limited Lifetime Warranty. Diameter (mm): 7mm. Number Of Wires: 8. Core Material: Magnetic. 03-12-2013, 09:21 PM. make sure your meter leads are touching the mettalic parts inside the boot. sometimes I use a screwdriver as an aide. if you removed the plug wire from the coil odds are high you destroyed it. thats why the coil and wire is sold as an assy. not all yamaha coils have removable wires. Step 1: Safely Disconnect Both Ends of the Spark Plug Wire. Before proceeding, ensure the engine is off and cool to the touch. Slowly and carefully disconnect both ends of the spark plug wire you wish to test. One end is connected to the spark plug, and the other to the ignition coil or distributor. Step 2: Open the Hood And Detach the Wire. As the engine is cooling, open the hood. It might take a machine up to half an hour to cool down after starting. Water will be present around the spark plug’s well. In any case, cut the core plugs, then take hold of the rope with your hand and the boot. New spark plugs and wires can also improve your fuel economy. O'Reilly Auto Parts carries ignition wire sets, spark plugs, and other ignition parts for most cars, trucks, and SUVs. Shop for the best Spark Plug Wires for your 1997 Chevrolet S10, and you can place your order online and pick up for free at your local O'Reilly Auto Parts. DIY Tech Tip from Lowbrow Customs: Motorcycle Spark Plug Cap, Terminal & Boot InstallCheck out spark plug wire sets for motorcycles here: Coil-on-plug assemblies are designed to convert a low voltage (primary side) to a high voltage (secondary side) to fire the spark plugs. They perform the functions of both the ignition coil, which creates the spark energy. Today’s coil-on-plug assemblies come in a variety of physical and wiring configurations. The typical configurations are These are your plugs. Figure 1. Pull up on the hood release latch found under your steering wheel. Figure 2. Press up on the level to release the safety catch. Raise hood. Figure 3. The plug wires terminate into a boot that caps the spark plugs on the side of the engine. xaxn1W.