Is that back to back starting attempts or over the course of multiple hours? If back to back (or relatively short time) it might be a heat induced issues where the solenoid or relay is heating up and sticking.
Good luck! I don't think many were made and not sure any made it into HMMWV's. If you happened to find a new one, I had seen prices of $12,000. This is the ultimate 6.5 series engine but sadly they stopped producing almost as fast as they started.
I did what the OP is looking to do on my first M1010. I converted the truck to 12 volt only and wanted to keep the two isolated when the truck was off, so if one battery died (bad cell) it would not suck both batteries down. I used a Blue Sea solenoid (500 amp continuous, 2000 surge). It...
Most recent work was adding indicator lights to my dash project. With the new gauges, I lose some of the factory lights so I got a M1008 volt meter panel (doesn't have the rear door open light) and added K-Four Legends indicators.
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