Battery light

My battery light comes on about 5 min. after starting my truck in the morning, my alternator shows 14+ volts and dosen't show a discharge on the meter and my lights are bright. I plugged my multi-meter into my Cig. lighter to check voltage while driving. After the light goes out, it won't come back on until the next day. The battery green eye is green and holds a charge. I did a load bank test on the battery it was good also. I checked all cables for chaffing and battery connections. I need some help. Thanks Randy