Truck Repair: 95 dodge diesel truck, dodge diesel, diesel truck

Question
My truck will start and run in the start mode,
however when I release the key and it springs
back to the run position the truck quits and will
not run.
I have replaced the ignition switch already and
it did not help the problem.

Any ideas ?

Thanks

Answer
All I can tell you on that is it is loosing key swith voltage(red wire on solenoid).There is a relay on cowl right behind fuel pump that operates that.That is a Dodge problem.If I can ever get a wriing diagram from Dodge,I could fix some of these problems that I have run across in the past.I wish I could help more,but that is on the OEM side & not Cummins side.