Cummins N14 Died, Now I have Slow Crank. Help!

(1) manually bar engine over. If good, (2) run a ground cable from batteries to starter ground post

 

Did it run rough or make any noise before it died?

There’s only a few things that’ll make one die. Lack of fuel, loss of power to ECM, and loss of power to the fuel shutoff solenoid are the first things that come to mind. But being as it died and now cranks slow, I’m worried you’ve got engine damage. First thing I’d do is bar the engine over by hand and see if it feels normal. I mean, they’re kinda tough to bar over anyway, but if it’s real hard, it may have spun a bearing or worse.

Sounds like you’ve done just about everything as far as electrical.

 

In the old days long ago if you hammered up and over a set of railroad or some other problem too hard with the pre computer engines, it will be a chance it just dumps running and quits. And there you are cranking.

Today's computer trucks. they drive me crazy.

Im betting the farm on the batteries. Second draw would be the cable to the starter. If you cannot pipe it ... and the river card would be the engine itself inside.

 

Have you tried to crank it with the clutch push in? Maybe clutch is dragging, damaged.

 

Do you have the fuses or relays inside the battery box. .
If so,I'd be looking there.

 

There is a solenoid on the firewall for the starter also. Check that I think it's on passenger side

 

If the truck died crossing rough railroad tracks, then that was caused by the failure of an electrical connection to the ECM I would think. But I’m not sure what that would have to do with the starter not spinning sufficiently fast. It seems that would be a separate issue from the engine dying due to low or interrupted voltage to the ECM. BUT, that’s what started the issue, so maybe you need to back up and think it through from the beginning. Did an unfortunate set of circumstances bend a valve when it died? So now the engine is in a bind?

 

Ok you have a problem and it's going to be bad. Either crankshaft or your pistons may have crunched some valves if they are the kind that open into the cylinder in certain timing when the piston is on it's way back down out of the way or something. Bearings is another thought.

But I think to sleep on the gloom and doom tonight. If the wheels locked on a rolling manual start then shes locked in the engine.