I am having a problem with my Supra, it lost spark. I have replaced points, condensor &amp; coil. I have checked the coil wire resistance &amp; it's fine. I have checked output from the new &amp; old coils &amp; there is none. The purple power lead to the coil has power with the ignition key on &amp; the negetive side has power when turning over the engine. It is a simple system but it's kicking my ass right now b/c we were supposed to ride in the AM<img src="http://www.wakeworld.com/MB/Discus/clipart/angry.gif" border=0> I have pulled one of the plug wires &amp; used a plug tester as well as a new plug grounded to the block to confirm that there is no spark.

Well it ended up being a defective coil &amp; some plugs. Check your coil wires before you replace parts!