How do you know if the coil is bad on your 2002 Harley Davidson Ultra Classic?

If you have a bad coil pack the bike will not run. Take a spark plug out and reattach the plug wire then hold it to a bare metal part of the motor so you can see the bottom of the plug. Try to start the bike and see if you have a spark on the plug. If you do then the coil pack is OK. If you don't it's probable bad.