Originally Posted by
gsimpson
batteries seem barely top turn it over even though I have charged them both
This line jumped out at me. The 6.5L requires a rather high RPM during the cranking process for it to start. If the engine is turning over rather slowly, that will be most of your problem.
How does the engine spin over with the glow plugs removed?
Listen to my engine starting at the beginning of this clip to hear how fast the engine should turn over:
https://www.youtube.com/watch?v=cZ2J57p8_MA
If your engine is not spinning fast enough, checking the battery cables and starter condition is the first step.
Casey
1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter