Home › Forum › Ask A Member › Problem with substituting OMC coils in an antique › Re: Problem with substituting OMC coils in an antique
George
THe coils were originally designed for single cylinder use. In this case the polarity of the coil is of no concern and either polarity will work as well as the other one.
When they are both installed on one core they will not fire if their polarities are opposing. this is exactly what you observed.
A final caution – for best results both coils should be as identical as possible. This is to insure the voltages produced by them are as nearly equal as possible. They will work with some voltage imbalance but I suggest you get two coils which are identical.
Maybe the wires were installed on one of the coils incorrectly. See if both green wires come out of the coils at the same side relative to the spark plug wire.