Truck Repair: n14 cummins celect, n14 cummins, afew days

Question
afew days ago,our truck started sputtering and pouring black smoke out of the exhaust.  we have changed all of the filters,checked every fuelline for leaks,had the #6 injector replaced.  when the truck still had the same problem, we had a new head and head gasket for the #5 and 6 put on.  the truck still has the same issue.  last night ,the truck was running on only 1 injector???  how is that possible?  we think now that there is a problem with the groung that goes to the #6injector.  please help!!!

Answer
Glory,
You need to provide more information on your question by looking at the following:
1. Is there a fault code displayed on the fault code monitor inside the cabin.
2. If no fault code is displayed, have you had previous electrical problem that had been resolved without using "insite" or compilink.
I advise you to contact an authorized workshop where they have the facilities to do a proper troubleshooting of the fault.

Good luck.