Basic Igniton problem... no spark

here is a quick run down on the ignition system for you

key on = power to (+) side of coil (possible on (-) side too depending on point position)

key on /cranking = power to (+) side of coil and blinking power on (-) side of coil should have spark @ coil wire

key on /cranking = power to both sides of coil (no blink/steady lite on (- )side)= points dirty or not making circuit to ground

key on /cranking =power to only (+) side of coil (-) side no lite no blink = points grounded