Thanks for the response.

I run on an MRC Prodigy Wireless DCC system.  I set the consist up with the cab cosist tab. An A B running forward and an A running in reverse.  Another consist with two EMD F7s does the same. If I run them with the same engine number both headlights turn on, but they have to both run forwards. In a consist with on running in reverse the headlights do not turn on and off.

I shall try  the CV changes you suggested to see what happens.

I madea three engine consist of three Bachmann alco f7's DCC w/sound.  The consist will run fine,butthe lights,bell and horn will not operate.  Is this SOP for Bachman engines?