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All the Dyna coils I've used - (same model, different primary resistances from the one you refer to as green - my experience is with brown and blue) have the secondary circuit isolated from the primary, i.e., no shared ground.

As to whether you'll get a spark with only one secondary tower connected - well, not a good one if you do, since the resulting circuit completion would not be through the other tower (and plug) as expected but rather will have to be an "unnatural" path to ground, perhaps an air jump inside the coil. It is even possible that Dyna intentionally left such an air jump but I'm not going to take a coil apart to find out.

If theres no shared connection, wonder why he got a resistance reading?
Maybe a secondary short to ground?

Jean - I think he said he measured 30K between towers - that's just the two ends of the secondary winding, no connection to the primary side on the Dynas. John

Thanks John. That is what I needed to know.

I sat down yesterday afternoon and had a good look at my conversion and am quite sure I can fit the Bosch Super Coils under my big wide seat. The bike runs soooooooooooo nice with them right now, I don't realy want to tempt fate with another change.

ok John I recall I advised to measure res. between the primary and one of the towers to see if there WAS a common connection...I thouht that's what he did. (yeah, I can spell, 2 of my KB-keys are flakey just now. maybe cat-hair? or needs a new capacitor!!)

Jean wrote: (yeah, I can spell, 2 of my KB-keys are flakey just now. maybe cat-hair? or needs a new capacitor!!)

Naaaa, they never fail, just try some new points.

Mine fail all the time...Duane's never. It's Murphy's law. I must get all the bad ones!
Hey, it's working now!! I chaned the oil...never mind, it just quit.