i just finished up the 4.6 to 5.4 swap,started to hook up battery to start,a lot of sparks at battery,found that my friend that i trusted to hook up starter hooked up the pos and neg wires together, i swapped them,everything comes on but no starter,checked the fuse under the dash,ok,jumped the relay and engine turned over,so starter is ok,relay bad?help these newer vehicles give me fits,thanks in advance rob