here are numerous links on how to test a coil from youtube http://www.youtube.com/results?search_query=test+ignition+coil&oq=test+ignition&gs_l=youtube.3.0.0l6j0i5l3.1673.5590.0.7288.15.14.1.0.0.0.135.1278.10j4.14.0...0.0...1ac.1.11.youtube.Dsxu_v-lwdM I know that mossmotors has a good one - you might search on that within youtube