Remember that Ohio-based firm that planned on converting 300 or so Saturn Skys into all-electric roadsters? Advanced Mechanical Products ring a bell? At any rate, said outfit has just hosted up a video of its fourth test drive of a prototype, which is shown sporting an "Electric" badge on the front fender and a whole mess of batteries and wires underneath the hood. Oh, and then there's that unmistakable whizzing sound as it cruises on by. Check out the video after the jump.