Ihave an 07 f 250 6.0 l it threw some codes saying injectors 1-7 circuit low. I goggled it and most were saying ficm. It wont start in the mornings it cranks and cranks. I figured out that if you plug it in over night it will start like nothings wrong. Got batteries tested there good but while running only putting 12.5v after waiting over 5 min. Is alternator bad? Or is that from cranking on it.it reads 48 v on ficm when keys in the on possition. Thanks

 

Moved to the 6.0L Powerstroke Diesel forum.

 

Yes. I think this forem things pretty sweet

 

Have your batteries check/load tested.

Test FICM

KOEO(key on engine off)

Test it cranking it over.

Test it while its running.

See what voltage you get.

Seems your FICM is failing.