[Prewar Coil Problems]

Here is a good explanation. Coil Test - Testing Your Ignition Coil - Coil Resistance Test - How To Test Your Ignition Coil With an Ohmeter

You will, however, need to know the proper values for your coils. If you can't find said numbers, you can test both coils and then compare numbers. If, for example, the primary on one coil is 3 ohms and the second coils reads 30 ohms then _one_ of them is bad.

[Anyone watch American Pickers last night?]

Loved it. Can't wait for more. As long as they keep the show focused on what they find and stay away from 'relationships' it will be fine. There will always be something cool in the next barn... no need to inject soap opera themes.