External Coil Test?

My coil is getting juice, but how do I test if spark is coming from the coil? I tried plugging a spark plug into the coil wire but I don't see a spark.

But I also don't know if that is supposed to work.

How do I test a coil?

Yes a grounded spart plug on the coil wire should work fine

Make sure the coil wire is good and there is no carbon track on the coil tower. Clean the top of the coil well.


What ignition do you have, points?

M1d

come on man up, lick your finger hold the coil wire and crank http://www.lislecorp.com/divisions/products/?product=80

actualy a spark plug is lame.

I always stick a screw driver in the coil wire and hold it so the screw drive shaft is about 1/4" away from a ground source.

I do that because I need the variable gap. I want to see a good spark and I draw the spark longer to about 1/2" How long of a spark you get is an indication of how many volts its producing which is a good measure of the ignition systems health.

A real HEI should give about 1/2" to 5/8" spark (60,ooo volts) that older style coil of yours should give about a 1/2" to 3/8" spark about 35,000 volts

M1D

Was threw that last week and it was a bad coil. took it to auto zone and they test for free. a brand new coil was bad, they gave me a new one.

https://s829.photobucket.com/albums/zz213/gVanSource/zzz%20-%20My%2068/

If it needs a password it's: unlock