Notice what Alan said, ALL power for the track in the block must go through the BD20.
I have three BD20 on the same module, about 3" apart on separate mainlines.
Two work like a charm, one is always triggered.
I checked the wiring, and the two working BD20 are on track with a single track drop (about 6').
The not working one is connected to track with multiple track drops.
I will be investigating how to have the feed through a single drop.
Thomas
DeSoto, TX
