I owned a 1995 Chevy 2500 with a 6.5 turbo prior to it getting stolen and had it for 7+ years and about 150k miles. An electronic 6.5 diesel that "Doesnt Run" is kind of a broad statement. There is so many things that could be wrong other than an internal motor problem that I would be wary if you arent familiar with wrenching on these as throwing parts at these motors can turn out very expensive.
Most diesels that dont run have fuel system problems, I have seen these motors run with cracked blocks, holes blown in pistons etc. but if the fuel system read injection pump isnt working nothing is going to run or even try to. Electronic pumps run around 11-1200 dollars rebuilt, (I put three on mine) Pump mounted drivers or the "Black box" run between 2-300.00, lift pumps oil pressure switches etc are all notorious for going out and causing no start condition.
Usually Internal engine problems on the 6.5 result in catastrophic failures, Broke rods hanging out the oil pan, crank shafts sheered in two etc.
The second truck I bought on my own was my 1995, Bought it used in 1998 for 13000.00 while I loved the truck over the 7 years i owned it I became very adept to wrenching on it. By the time it was stolen I had over 15 thousand in repairs between the motor and transmission (nv4500). When the cartel stole it and took it to mexico after having a fresh rebuilt motor put into it, I figured I would wash my hands of the electronic hassle and go mechanical (93 Back), I found an 85 with a 6.2 and drove the pee out of it for a couple of years and am now putting a 2001 amg 6.5 with all of the internal upgrades before the P400 came out and couldnt be happier because without the headache of the Electronic fuel injection system its a fairly reliable power plant.
With all that being said before you throw a motor at the truck if you get it get the injection system checked out you may save yourself a couple of thousand dollars.
