1) Could you explain what primary and secondary is ? 2) I don't anderstand what to connect to. One lead of the ohm-meter as red wire and the other connector lead as black wire. Where shall the ohm-meter red lead be plugged to ? and where shall the ohm-meter black lead be plugged to ? (please forgive my bad english speaking skill) 3) You mean i shall put each ohm-meter lead between each ignition coil part where the sparkplug wire connects to ? 4) Looking at this picture, are my tests wrong ?