540/8800 Coil Testing

[jbartlett27513]

I have a 540 with a bad coil.  No Spark, I replaced Spark plug wire as original was flakey but still no spark.  I looked online but cannot find a Test Procedure for this type coil with the extra ground wire coming out of it.  I want to know the exact procedure to test Primary and Secondary windings and isolation between them.  Has anyone ever repaired one of these coils?   Is there a link to the Service Manual for the 540 or 8800 saws?
Thanks in Advance
Jim B.

[undee70ss]

Don't always assume its the coil, could also be the flywheel... See vid
www.youtube.com/watch?v=JOdLgX7I9A0