your first post says ohms, not amps .... I think you might find using that formula with 6V would yield the stated 4 amps - did you get a kit for a 6V system?

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