It will cost you almost as much as actually buying a Jeep with the 4.0 in it. Its not very cost effective.
By the way, please punctuate your sentences. Welcome to the Z.
What the hell? Everytime I see a post like this with no punctuation, I have to read it in one breath. Remember, punctuation is your friend.
Now, it seems to me like you have a short somewhere. Good luck tracing the wires.