45von is correct. The secondary coil, inside the coil on battery ignition systems, is what actually makes the spark. It can only do so when the points are open. When the points are closed, both the primary coil inside the coil and the condenser (which is really a battery) receive current. When the points open, the rapid loss of this charge to the primary coil windings induces a large voltage in the secondary coil winding, That is the source of the spark that ignites fuel. The condenser sends its charge along to the primary windings as well. Happily, the condenser also prevents the arc that would otherwise happen when the points close again so they don't burn-up rapidly.

You're correct on both counts. It would replace a bad magneto if a suitable stock replacement isn't available and is used on engines like the Kohler shown that don't have a magneto ignition system. Hope all is well my Friend! Cheers!

The coil creates spark when the points OPEN, not close. When the circuit is closed, the coil creates a strong magnetic field. When the points open, the field collapses, with electrons going into the secondary winding and discharging across the spark plug gap.

Thank you buddy, I appreciate your time and kindness!

Great Video, You have the best Video to explain the right way to connect the Coil to the points and condenser. One thing in your statement you first stated Capacitor for the Condenser then changed the wording to Condenser. You are Right the first time most people doesn't know the Condenser is a Small Capacitor. It build a electrical Charge and make the spark on the points hotter. Great Video Plus AAAAA++++++.

You're the best of the best of the Whole Wide West. Thank you. You've explained it well.

I'm glad your question was answered! Thanks for stopping by. Cheers!!

Thanks that's a really informative lesson I can start working on my sl100 ignition system tomorrow

first time I ever heard that explained. great job

In the commentary from 0.55 to 1.15 min the description is wrong , In the external battery powered coil current is flowing through the coil when the points are Closed creating a magnetic field from the primary winding in the coil that surrounds the secondary , ( high tension ) winding , as the engine rotates to the correct position to fire , the points then Open.!! The current flowing in the primary ceases and the magnetic field collapses , that is where the condenser comes into play , it reduces the arc when the points break and ensures a faster collapse of the primary field

Very true and great advice! Thanks for your input. I hope others read comments to learn of this addition if using an automotive coil. Again, thanks much!! Cheers!