ok tried 3 different coils and no go have 12 volts at both terminals of coil when key is on so i'm thinking its a bad ecm becouse don't they controll the on off trigering of the coil.
i think what the OP is saying is that the ECM is failing to provide the grounding cycle for the coil. are these known
coils that your are testing with?
however you will get voltage on both posts if the primary winding is ok. there is an ohm spec for the seconadary to primary windings so check that too.
if the coil tests good hook up your test light in series after the coil. like this:
Power wire -> Coil -> Test Light -> ECM.
crank the engine and watch for a flashing test light. if it flashes with no spark induced, the coil is no good and the electronics are ok. if is doesnt flash, the electronics are suspect and need further testing.
either the sensor in the dist. is bad or the ECM is bad. it is possible to test the output signal from the dist. if that tests good, its the ECM.
its a process of elimination because testing the ecm circuits is impractical
Let me rephrase that
Make sure the dizzy is getting 1.5 volts and make sure the ignition module is grounding the coil.
the ecm controls the ground to the coil via a transistor thus eliminating points and a condensor. the dist. has a sensor that generates a reference timing signal for the ecm to do its magic.