[Vrobert]

Gents, I am working on a 53 Allis-Chalmers Model G with positive ground and I can't get spark. I know it's not a cub but lets pretend it's an old Farmall. My question is about 6 volt ignition coils. I'm trying to determine if it matters which side connects to battery and which side connects to points. From the searches I've done, I read that I'll get spark if it's connected either way but I'll get better spark if it's connected correctly.

1. Are coils made differently for positive ground systems?
2. Does the minus terminal always go to points, or always go to negative DC power?
3. Does it matter which way + and - are connected?

As an aside,there is some misinformation out there about how coils work and this may fire up a contentious debate, but here goes. One misunderstood fact is that coils generally don't have a ground. When the points open and the magnetic field collapses around the secondary winding a current is induced to create the spark. Since most coils don't have a grounded case the current flows from ground through the battery, through the ignition wire to a coil terminal (plus or minus) through the secondary winding, out the high voltage spark terminal, to the distributor, through the rotor to a spark plug wire, through the spark plug and across the gap finally back to ground.

Thanks for taking the time to address my question.