Re: Problem with substituting OMC coils in an antique

[jeff-register]

George,
On your motor are we looking for both coils to fire together? How about the stock coil had only one primary winding correct? If now with two coils on the same lamination we must convert two primary windings into one winding so both coils fire at the same time. I’m thinking to tie the two primarys together some how in series. Remember on the double coil there is no ground it ties to the center tap of the coil. I believe that is the key is to tie the primary ground to the other coil ground not touching motor ground. Just think one winding using both windings in series not grounded. Remember the primary & secondary windings are already bonded together as only one ground emitts from the coil except old johnson coils have a ground wire for both windings. Take the ground from the first coil & go to the mid point winding on the second coil then ground the ground wire. Keep the mid to ground connection isolated from metal. Trying to load up both coils at the same time in series. Educated guess. Two old Johnson coils would be easier.
Have you thought of the cap? It may need to be doubled too for twice the windings.