i have 3 dryers that have been sitting outside for about 6 months. i wanted to use one of them and found that when i plugged them up to use them that they would only work when i hold the start button. if i let the start button go the dryer turns right off. this happens on all three dryers. help please:)

Your motor start switch may have failed on all of them. You might want to take apart these and blow air on the motors to dry them off. You can also exercise each motor switch while spraying with a non-residue cleaning spray.