For a good site on 6.2 info and how to repair, visit:
https://www.steelsoldiers.com/
Download the CUCV Technical Manuals(TMs). They have a wealth of step by step procedures on troubleshooting and repairing almost everything about CUCVs.
CUCVs are a slightly militarized version of an 84 K series Blazer(M1009) and an 84 K30 squarebody(M1008). Both came with a 6.2 diesel. They also have 24V electrical system for compatibility with other military vehicles but even then, most of the stuff is still 12V.