How can I hook up a 3 prong plug to a 4 wire outlet. The dryer has a ground strap which the old one didn't. The outlet has 4 wires which I can wire directly to the dryer (which is how the old dryer was wired), and skip the outlet and plug. How can I ground the wire to the dryer that has the ground strap? Any help would make my wife and life very happy. Thanks.