NewLife, maybe you could be watering too much. Feel in the ground with your finger as far down as you can. the first couple inches doen't matter as long as there is moisture the next several inches down. beans dont like "wet feet". does the leaves turn yellow before drying up? is the leaf yellow but the veins green? look for slugs, they can destroy a patch of beans..too much nitrogen will burn the plants roots, so if you want to use commercial fertilize use something like 5-10-10, I dont use commercial fertilize on anything in my garden. I use composted manures, chopped leaves, grass clippings, bone meal, epsom salt, amd a homemade compost. I am a firm believer in mulching heavy, at least 3-6 inches deep. this holds the moisture and you wont have to water as often. be sure you use the right amiunt of lime, take a soil test reading. you can get a DIY kit at any big box store and they pretty good.
good luck with the beans , just don't give up, theres still plenty of time to start a new crop now
Errol