CJ360 Fried Spark Plug Wire

[TJGM]

Hey guys,
Noticed the wire from my spark plug to the coil is burnt to a crisp. Once the tank was off I noticed the other coil has been replaced already.
I guess my question is, what would cause this ? Was the coil effed and a new once fixes the problem ?

Also, looks like I have to replace the whole unit and not the the wires, correct ?

Thanks,
~T

 

[DohcBikes]

Hey guys,
Noticed the wire from my spark plug to the coil is burnt to a crisp........



I guess my question is, what would cause this

Heat.

 

[VonYinzer]

Burnt how? From the inside out or outside in?

 

[TJGM]

Inside out. I tried to take the left plug out and the plug boot fell off. And closer to the coil the wire is almost burned in half. The outside of the wire is otherwise fine.

~T

 

[Sonreir]

Sounds like you may have a bad coil and/or short in the plug or plug wire. You might be looking at multiple issues.

Plug wires are thin because they don't need to handle a lot of current, only voltage. So if they melted from the inside out, then it's possible that the primary is feeding into the secondary windings as well as the plug wire grounding against something (12V isn't enough voltage to bridge the gap in the plug, so it might be getting to ground some other way).

I'd replace the coils as well as the coil wires and plug caps. Probably the plugs, too, since they're cheap.

 

[TJGM]

Tested the coil, it seems fine. Once I got it off the bike, I noticed where it's burnt through at the top near the coil looks like it might have rubbed and chafed through.

Gonna slap a new coil in there and see what happens. ( And wires,caps,plugs )

Cheers,
~T

 

[TJGM]

And mechanic friend said he's seen Battery Tenders fuck up coils on old bikes. Anyone ever heard of that happening ?

~T

 

[Sonreir]

And mechanic friend said he's seen Battery Tenders fuck up coils on old bikes. Anyone ever heard of that happening ?

~T

Nope. Not sure how that would even be possible.

You can cook old coils if you leave the ignition switch and kill switch on, but that shouldn't have anything to do with a battery tender. That's a bit of a red flag to me.