I'm converting a 15' X 4' from DC with blocks controlled by toggle switches to DCC. Big outer loop has one block 4' long in front part of the platform. I rewired existing wire feeding this block using 16 GA. stranded and DCC works fine. The outer block which is about 23' has only one feeder 16 GA. My DC trains will run fine on both blocks. DCC won't run at all on the 23' block. The polarity is correct. I checked on the DC mode using a Digital VOM. Is my problem due to not enough feeders on this block? It won't even run where the one wire is connected.