What kind of electrical signal is involved with the spark plug? I know the voltage is amplified with a induction coil to thousands of volts, but is the signal just a simple pulse? What kind of current is there? Does the current create the spark and then return through the same cable?
I just hooked a split core current transformer with 3000 windings around a spark plug cable and got nothing. I'm trying to re-create a signal similar to that which a timing light would use.
Really, I would like to just know when this engine is on and off without any lag. I also don't want to shutdown the engine to install it.
Any ideas or help would be much appreciated.