Re: Problem with substituting OMC coils in an antique

[jeff-register]

George,
The coil is basicly a transformer. You proved this with voltage. Figure each coil having two coils of wire. Two windings have 4 ends correct? Now the primary winding has one end go to the points, the other end of the primary winding goes to ground & also goes to the secondary winding end. The other end of the secondary winding goes to the spark plug.
What I was trying is to tie both coil primary windings together so when the points set contact set opens both coils would see the spike & cause both coils to fire.
The two cylinder coil only has one primary winding & when the points open the one primary charges the one secondary coil. Difference is the secondary coil is isolated completely from ground. Both ends go to plugs. When one plug fires it sees a ground & the second end of the secondary still has enough energy to fire the second plug.
What you are trying to duplicate is built totally different windings & taps to the ends of each coil. I was trying a way to tie the primary of both coils together to get the coils to fire together. Hope this helps, No formal training here, Just Jeff reading.
P.S. If you have a sensitive ohm meter the ground terminal wire to ground should show .5 ohms at the most. The primary winding has very little resistance.
Jeff