2000 Ford Expedition Q&A
2000 Ford Expedition Question: why does my positive battery cable spark when I try to place it on the terminal?
There is some keep alive memory that draws power, and some cars will turn on lights and other things as if you just turn off the key. Some spark is normal, a big spark is worrisome. If you hooked the wires to the motor side the starter motor would try to turn and that would be a good sign you hooked it up wrong. - ProfessorG
does the battery go dead if you leave it connected overnight? - globalhelper