Okay, I need a sanity check here... this should be a very simple test, yet I am at a loss. First, electronics is my business, so I am very familiar with digital multimeters and transformers, etc. I'm trying to check a coil-in-cap HEI coil for a street rod that has no spark. I have multiple factory manuals from GM with the diagnostic tree for the HEI. I measure the primary resistance, between Bat and Tach terminals, get 0.3 ohm. Okay, that's good. Then, it shows in every schematic that the secondary is measured between the carbon button and the Tach terminal and then the button to ground, should be 6k to 30k ohm. I get infinite (open). The first 2 coils I figured were just bad. The 3rd & 4th I was puzzled. Then I pulled the coil from a working car's HEI and can not get a measurement on the secondary. I've tried every combination of connections between the button contact and coil wires. Tried 3 different DMMs. Nothing. I can measure the carbon button (150 ohm) and the pickup coil (800 ohm), but no secondary. What in the world is going on here? I am completely lost with this. I remember checking HEI coils before. I don't think I used a VTVM to do it, I'm just lost!