I had it in the sun several days while I moved. As far as I know, there's no way to tell if it's at full charge.The black wire at the bottom is not hot correct. RIght on red and ground wire. (mine is also 100 ft.)
3 ft of ground rod is plenty for a .4 J fence
BUT the HOT parts of the fence should not be touching the ground.
Did you allow the charger to fully charge before using?
chargers pulse - they arent' zappy all the time
THe Galls40 has two settings a hyper day and night mode, and a hyper day slow zap night mode.