Overdrive not kicking in,Alternator not charging,glowplug light not comin on. HELP

[Cummins Man]

The other day all of those problems started happening. I dont know whats going on. My alternator is still good went and had it checked and new brushes put in it. When i crank it my "wait to start" doesn't come on til AFTER i crank it. I need help NOW!!!! can ANYONE help me!!!!
Thanks
Dusty