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If you haven't already downloaded the free manuals for the HMMWV I'd suggest you do it as soon as possible. 98% of the problems your going to have with the truck are covered there along with simplified flow charts that help you diagnose issues. The wiring diagrams for the vehicles are located...
What "switch ground"? Did you mean battery negative? I have to agree with coug, it sounds like you've connected the +24v power to the converter to the neutral start line. You want to pick up power from the 27A lead. This will be hot whenever the truck is running.
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