2004 F550 goin down!
 

My 2004 f550 started having hard starts yesterday about mid day when temps were in the mid 50's. No warning just hard to start. Took about 10-15 sec to fire up, then vroom. Any possible suggestions as to what might be happening?

Have your batteries load tested. Then test the FICM. https://www.dieselbombers.com/ford-p...procedure.html

If the FICM is bad, let me know, I can fix them.

When you're cranking the truck over, is there any smoke coming out of the exhaust?