[Sid]

Coils don't really care if they are 6 volt or 12 volt. On a 12 volt system the resistor cuts voltage nearly in half anyway. It's the ohm rating to be concerned with. 1.5 or thereabouts on primary side is what you want. To test the secondary side put your meter on 20K. Put one lead on the + post and the other lead in the coil tower. You want a reading of around 9,000 give or take 1,000 or so. 3.0 ohm on primary side is usually considered a 12 volt coil. Also is there any chance you purchased a bad condenser?