I have a low voltage (12V) transformer for my lighting system, It has in it a 3AG Time Delay "Replaceable" 3AG Time delay fuse. Some days the timer sets the lights on at the appropriate time and goes off as well. Other days it is out of sinc going on at later and staying till the Early hours. Yet when I look at the time of the timer it is always correct. Could this fuse thinmg be at the root of my problem?
Thanks: Gary

Could be if the element is loose inside, but I doubt it. Just a defective timer.