New Member here 2007 VNL 670 isx

First of all wanna say thank u for this forum who ever keeps running.Help me in lot of question.
Now i have serious problem with my ISX cummins.

1.ecu battery potential
2.Power supply MID. 128 SID 251 FMI 2, MID 128, SID 27 FMI 3,

Causing me problems when im driving it will start dropping speed from 70 to 50 raise back to 70 than back to 50 and it will stall there while fan will kick in and run for good 4-5 min.. Sometimes it wi run fine for days but when iz start acting like this causing truck to shut down while driving on 60-70 mph... All i have to do get out of the gear turn key off turn back on but really hard start put in gear and continue driving until will happen again..

Went to diagnostics couple times at Cummins of Jacksonville, they also check all batteries,conectors and nothing has been found.
Running out of idea what it could be..

What u guys think.. Thank u !!!

 

Thanks will also check next time,when it cuts off. So turbo could be going bad or just wires .New at this and first truck that i ever own.
Will post all codes as soon it happend!!!

 

It sounds like am going to have lot of fun looking for that wire.. Thanks.. will start as soon as i get home.