Not sure where the proper place to post this is. Looking for some insight in how to determine why there is no spark in Jonsered 621. Pulled the flywheel, no obvious loose wires or connections. Points appear to be in good shape. I can clean them up. Question is how to determine if problem is in the winding, condenser or coil. Assume each need to be tested with a voltmeter? Not really sure how to use one and what I am looking for with each component. Advice is appreciated.