welcome to the shop Jim, this is the place to find your answers!

the 12V ignition setup uses an ignition resistor to cut the coil voltage by design [bypassed when the starter is engaged] - not needed with the 6V setup, and I'd expect you'll find the coil is marked 12V, or should be .... other parts the same for 6 or 12

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics