After a weekend outing and parking my Class A Motor Home I went out two weeks later and it wouldn't do anything when I turned the key on to start. The dash lights would lite up but the Automatic Shifter indacator lights that tells you the Unit is in Netural did not light up . Checked all fuses and batteries but all were good . My question for someone is if the lights on the shifter do not light up showing it's in nuteral will this keep the Unit from even trying to start . ? If the ECU unit on the transmission has gone out will this pervent starting the diesel motor ?