If the shift pad isn't lit up you won't be able to start the engine .
There has been a recent post , about the Arens shifter ( SBW ; Shift By Wire ) used on the 2500 series Allison transmission , getting water into the mechanism at the trans and blowing fuses .
Do you know your transmission series ? 2100 ? 2500 ? 3000 ?
Sorry I should have asked about this in my first posting .
Being that you list the HP as 300 , I'll assume you have a 2100 or 2500 series.
In this link , the member describes where the blown shifter fuses are in his Thor. MH.
http://www.irv2.com/forums/f281/tran...ir-489582.html