It is very common to forget one of the wires that attach to the positive battery terminal. There are three wires total, each with a copper colored plate on the end with a hole to go on the terminal. One wire has a fuse box on the side with 1 or 2 fuses in it, one wire comes from the starter and the las is the one that usually falls below the battery tray. That is probably your problem, if not let me know. Leave feedback please!