Simple short post ... MH would not go into gear ...
1998 Dutch Star 3858 Spartan, 300 hp Cummins mechanical 8.3C, Allison 3060
Transmission gear display pad on dash blinking when placed in "R" or "D", not flashing in "N". Coach would not go into gear, no backup alarm sounding when in "R". Found the 3 prong connector loose on the Allison throttle position sensor. Cleaned it with WD40, plugged it back in and good to go.