Hi Bob,
Is your BD-20 before the PSX-AR?? If so, that is your problem.? The PSX-AR draws a little bit of power all the time and will cause the BD-20 to show the block as being occupied.
If you are using the same block detector for the reversing section as you are from B to C, you will not be able to do that unless you make the section from B to C part of your reversing section or use a separate BD-20 for the section from C to D.? In any event, the BD-20 has to go after the PSX-AR.
BTW,? Is your reversing section longer than the powered portion of your longest train?? It also needs to be longer than your longest train if all your cars have resistor wheels, your caboose is lit, or you have lighted passenger cars.
Allan Gartner
Wiring for DCC?
