All ignition wire insulation breaks down over time, and if yours are not shielded wires, it becomes visible in total darkness when the engine is running.
If you have a car or truck with a few years or many miles, take a look some dark night. You may be surprised at what you can see happening. Yes, it also happens with motorcycles , but usually their secondary ignition wires are not as close to a ground so is not that apparent other than performance degradation or poor spark. They also have metal core wires more often than resistance types, the latter which can also develop gaps in the conductor over time in any installation. Years ago, the worst case I ever saw was a friend's Olds 98 which he said "just wasn't running right" on a trip to SFO. I raised the hood while it was running one night in his carport, and it looked like the 4th of July, crossfiring and firing to ground everywhere. A new set of ignition wires cured all his problems. I agree that combining resistance wire with resistor plugs is a bad idea. George --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
