I believe Larry means checking the wire from the minus [-] side of the coil to the distributor, not the high voltage wire, although I think if that test doesn't work it could also indicate a bad coil .... as for being in left field wink the points opening and closing "break" the excitation of the coil causing the high voltage output to "make and break", the high voltage wire should spark when close to ground

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