not a problem, been doin it since forever, the 6v starter is gobblin up the power - just don't hook it up and leave it, have a helper put the hot lead on when yer ready to crank and take it off as soon as the 6v starts
"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