Connect the (-) to the ignition feed from the switch. Connect the (+) to the distributor points/condenser. The remaining lead should be the secondary led to the distributor cap.
Was your old coil from a magneto? I don't belief I have ever seen a battery ignition coil with four separate leads.
Electrically you cannot connect the primary leads, one to the ignition switch, and the other to ground, and have it work.Since you are working with DC current rather than AC in order for the magnetic lines of force to change to induce voltage in the secondary winding the primary winding must be turned on and off. That is the job of the points which must be connected to the grounded side. With the switch on and the points closed the current will flow through the primary winding and build up the magnetic field in the coil. When the points open the current flow stops in the primary winding which causes the magnetic field to collapse. The collapsing magnetic field induces the current in the secondary winding which will jump the spark plug gap when the voltage gets high enough.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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