my 2001 7.3 in a f350 automatic has this problem. tried to start in am, no wait to start light comes on, but the od/off on auto transmission handle is blinking on and off. Turn key off and back on, no blinking, instrument cluster lights up as normal but no wait to start light, engine turns over as normal but no start or attempt to start, engine has about 56000. replaced glow plug relay, still nothing. Help!

 

did you check the fuses? blinking od light usually means theres transmission codes and it's in limp home mode. it's also possible the ignition switch may be bad

 

Not sure on your rig, but the number 22 fuse on mine powers the glow plugs.

 

I have a 01 7.3 L powerstroke the wait to start light ain't coming on when I turn the key and wont start will turn over and all others power works and the overdrive off light is on I have a superchip flash paq that goes to the secondary computer port it comes on but when it says to turn the key on but not to start and I turn the key it doesn't register that i turned the key what should I check first

 

Check fuse 30 in the fuse panel under the dash. The fuel bowl heater can short and blow this fuse which also powers the pcm for communication. If it's blown, unplug fuel bowl heater, replace fuse and try again