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How did it go? Curious minds want to know.

Ohm the plugs regardless, that will tell you if you need to replace them. If you swap anyway, it's piece of mind knowing the age and condition. Just beware of swollen plugs potential before you get into it. Don't force, and you might want to invest / borrow a puller before you start.

Congrats on the HMMWV. If you swapped boxes hot, or were victim to old tech,then you probably killed the glow plugs. There might be a couple of other things to check and test as well. The flash / no start has a lot of threads, keep searching. The basic is a grounding harness, did you...