We have had "issues" with some Autofrogs working properly and some causing stuttering, and have discovered that just a few unwanted ohms in the wires from the DCC source to the track can cause the relays not to switch at all.
I removed one device from the layout and found that adding a few extra test leads (~ 0.5ohms each when measured on a multimeter) between the track and the autofrog confirmed the problem - from instant switching with one lead on each connection; to sometimes switching - sometimes not; to not switching at all. So the test you did showed it will work, but underlines what Phil S said earlier about a GOOD BUS connection to the track and from frog to autofrog is essential, and maybe a slightly poor connection is what has caused the problem for those who have had difficulty. (BTW with the poor bus connection the trains still ran ok until stuttering on the points)
- Stephen
