WOT- Coil on Plug Question

[rd]

How do you check to see if a coil on plug ignition, like a 5.4 truck is firing a plug, since you can't just clip a timing light around the plug wire anymore?

This is really for a Yamaha Waverunner, that I can't scan (yet).

Thanks.

 

[jrichker]

Use a neon test light like the ones used for testing household electrical circuits. There should be enough electric field to make the neon bulb glow. Try it out by holding it near the spark plug wiring on your car. That will give you some idea of how well or if it will work.

 

[rd]

Do you mean the ones that you place the tip near a circuit, and if theres power there, it lights up?

If so, thanks, can't hurt to try.

This thing is really annoying, as apparently you can only scan it with the Yamaha tool

 

[jrichker]

Do you mean the ones that you place the tip near a circuit, and if theres power there, it lights up?

If so, thanks, can't hurt to try.

This thing is really annoying, as apparently you can only scan it with the Yamaha tool

The neon circuit testers have two metal tiped pins that you stick onto whatever electrical circuit you are testing. They are cheap, usually less than $4.

View attachment 446552

Close proxmity to any high voltage electrical field will usually make the neon glow without touching the metal pins to anything.