no spark to distributor cap

OK you are going to have to slow down a bit

Just exactly WHAT comprises the ignition system? Is this breaker points or breakerless"

If breakerless what are you using for an electronics package and or is it one of those "ready to run" distributors with electronics in the dist?

SOME TYPES of electronic ignition do NOT draw coil current with key on/ engine stopped. GM HEI modules for example are of that type. Mopar ignition modules DO

So first we have to know what you are working WITH

Photos might help LOL

So far as "the simple stuff" are you sure the dist. is actually rotating with the starter?

Alternatively, do you have an old used (but maybe working) distributor that you can drop in?