The Meaning of Life, the Universe, and Everything.
Hopefully what I am explaining makes sense!
I have a hopper minecart hooked up so that when the cart hits a power rail a comparator has the hopper locked and powered rail is powered on. If I add items to the hopper it unlocks the hopper and un powers the rail. Once the hopper is empty it locks, rail powers on and hopper cart will go to the unloader.
Here is my issue: If I use a chest it will always keep the powered rail off because there are always items in the hopper from the chest overflow. Is there a way to also check the hopper minecart and once it is full the rail will also power on ignoring overflow in the hopper from the chest?
I added a couple of images from my simple loader setup.