I have been trying to diagnosis the ignition system using this schematic. The two resistors are good (0.6 and 0.4 ohm). I traced wires to under the drivers side front wheel well leading to a "metal box" (about 3 x 4 inch) that I suspect is the Transistorized Ignition Module or also referred to Transitor Ignition Unit. Any idea how to determine if this is functioning properly?

I have included a few diagrams from Internet surfing.

Thanks for any insights folks!