I am confused.
I thought I was being smart. I wanted to run lights off the engine, but I have had trouble running off the white wire. So, I thought, why not put another winding on top of the stock coils? This additional coil would not be electrically connected to the stock wires. So, I put about 250 windings on, fired up the engine, and measured 4-6 vac. Looks good. Connected the new coil to an LED tail light. Worked! WooHOOO! I am loving it.
But then I attached an incandescent bulb... and the engine died just like hitting the kill switch. I tried it repeatedly with the same results.
So, my question is Why? Why does a coil that is not connected to the engine's wires OR the ground kill the spark?