I watched this video on the ICM,
https://www.youtube.com/watch?v=kxogo2iXxeE and about 4 mins in to the video it starts talking on how the ICM works in "harsh conditions" and the video says it lengths the dwell time. they say strengthens the spark,


now in the old rotary distributor and points, yes there was dwell, (the time the points were closed), now the system was DC, 6 volt, (after the resister), to my understanding of transformers the transformer will not amplify voltage or reduce voltage unless it was either AC or pulsating DC, (thus the points) to pulsate the DC in the old distributer, and points system,
(and I am sure that the dwell changed the spark of the coil some, but there was only one spark in a point system, as it was charged and the coil no longer could amplify as there was not voltage fluctuation in the system, just as if you left the key on and the points were closed all you did was over heat the coil at times to the point of blowing it up.


OK back to the ICM when it increases the dwell time, does the (does the ICM) change the electricity going into a coil to a "pulsating DC", acting like "AC' (thus the coils would spark longer than one hit),?

or is IT straight line DC voltage powering the coils through the switching transistors, (electronic points)

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question two,

the coil packs, now from what I can tell and guess both plugs are sparked at the same time, (I am guessing the coils secondary is not grounded In the coil) but that it some how grounds through the plugs them selves (via the non firing cylinders plug) is that correct? or is it center grounded in the coil, the diagrams I have found do not show a ground,

from the diagram in the auto zones info, it does not show the coils grounded, in the coil, about 3/4 down on the page,
Ignition System

this illustration is not for my car but similar. and show no grounding on the secondary of the coil.
http://repairguide.autozone.com/znet...52801dba40.gif..