I chaged the battery cables and ground wires.The threads are about voltage problems causing automatic tranmission problem.Voltage Problems and Your Explorer's Automatic Transmission.Mine is doing this.Sorry I have the same problem when I go to the salvage yard.I don't really know the right words.
No problem, just give us a little background on your problem like you did in this post and we can piece it together.
I agree that you should use your Digital multi-meter and check your voltage at your battery with the engine running. You should be getting 14.7 volts.
If you see it spiking, bouncing or lower than 14.7v I would double check all your wiring connections. Your digital multi-meter should have a continuity check function, on most the Continuity check is a picture of an arrow with a + at the end much like this: >+
This function will help you test your connections. There should be a couple charts online to list wire gauge and the resistance they should naturally have. It may even be printed on the packaging of the cables you bought.
Now back to digging into the background of the problem. Did the transmission problems only come up after you changed the cables?
Edit: Don't worry about the vocabulary, spend a little time reading and posting on these forums and I'm sure you'll learn a good 90% of all the maintenance/repair vocabulary.
Also, if your daughter bought you a Haynes manual it will have all your wiring diagrams in there. This has been a life saver for me as I recently had to do a complete rewire on all the electrical of an 80 Bronco.