I'm a drummer by trade (50 years). I actually own an American Iron Horse Classic. It has lowered and stretched chassis, custom wheels, etc. It has the trusty 96ci Harley-Davidson engine. It has the screamin-eagle filter system, and a santee exhaust system. I love it, but love it less when the plugs quit firing on a highway ride. Pulled ignition cover and noticed the electrical lead screws on top and bottom were loose. Looks also like the inside of the cover has arc marks. What do I need to do to determine if the coil is any good or not? Is there a past thread on this topic? I may be dumb about my searches.

 

Coils are usually alive or dead, no halfway. If it sparks at all, it's PROBABLY good. I'd worry about those arc tracks, though. They will conduct electricity, and cause a short so that the spark isn't getting where it should.

Might be able to sand or scrape them off to clean material underneath.

Good luck