pete97GT

are there any disadvantages to wiring an electric fan so it is always on? I am just not too sure how to wire it so that it comes on at a certain temp., and i also dont really want to spend much money on this. I already have a fan, but thats about it, i can get a new alternator, but i dont really want to do that either. I am just looking for the simplest cheapest way to wire an electric fan to my 5.0. any suggestions??? thanks